diff --git a/README.html b/README.html
index f5cf735..3cf4bcd 100644
--- a/README.html
+++ b/README.html
@@ -55,6 +55,9 @@ data-cites="softwarefoundations"><span>“<span>Software
 Foundations</span>,”</span> 2021. <a
 href="https://softwarefoundations.cis.upenn.edu"
 role="doc-biblioref">https://softwarefoundations.cis.upenn.edu</a>.</span></li>
+<li><span class="citation" data-cites="algebraofprogramming">Bird,
+Richard, and Oege de Moor. <em>Algebra of programming</em>,
+1997.</span></li>
 </ul>
 <h2 id="теория-языков-программирования">Теория языков
 программирования</h2>
@@ -80,6 +83,19 @@ systems</em>, 2004. <a
 href="http://www.amazon.de/s/url=search-alias%3Daps&amp;field-keywords=052154310X"
 role="doc-biblioref">http://www.amazon.de/s/url=search-alias%3Daps&amp;field-keywords=052154310X</a>.</span></li>
 </ul>
+<h2 id="теория-типов">Теория типов</h2>
+<ul>
+<li><span class="citation" data-cites="github-learn-tt">github/jozefg.
+<span>“<span class="nocase">learn-tt</span>,”</span> 2023. [Online;
+accessed 4. May 2023]. <a href="https://github.com/jozefg/learn-tt"
+role="doc-biblioref">https://github.com/jozefg/learn-tt</a>.</span></li>
+<li><span class="citation" data-cites="tapl">Pierce, Benjamin C.
+<em>Types and programming languages</em>, 2002.</span></li>
+<li><span class="citation" data-cites="hott">Univalent Foundations
+Program, The. <em>Homotopy type theory: Univalent foundations of
+mathematics</em>, 2013. <a href="https://homotopytypetheory.org/book"
+role="doc-biblioref">https://homotopytypetheory.org/book</a>.</span></li>
+</ul>
 <h2 id="базы-данных">Базы данных</h2>
 <ul>
 <li><span class="citation" data-cites="db-core">Б. А. Новиков, Н. Г.
diff --git a/citations.txt b/citations.txt
index 060c12a..ef91aca 100644
--- a/citations.txt
+++ b/citations.txt
@@ -1,7 +1,16 @@
 ---
 title: "home lib"
 output: markdown
-bibliography: [db.bib, design.bib, fp.bib, sink.bib, logic.bib, langs/haskell.bib, langs/R.bib, sf.bib]
+bibliography: [db.bib,
+    design.bib,
+    fp.bib,
+    sink.bib,
+    logic.bib,
+    langs/haskell.bib,
+    langs/R.bib,
+    sf.bib,
+    tt.bib
+]
 ---
 
 ## Функциональщина 
@@ -13,6 +22,7 @@ bibliography: [db.bib, design.bib, fp.bib, sink.bib, logic.bib, langs/haskell.bi
 - [@computation-intro]
 - см. статью: Соответствие Карри–Ховарда: от матлогики к программированию и обратно тут: [@dubna-2017]
 - [@softwarefoundations]
+- [@algebraofprogramming]
 
 ## Теория языков программирования
 - [@github-plt]
@@ -23,6 +33,12 @@ bibliography: [db.bib, design.bib, fp.bib, sink.bib, logic.bib, langs/haskell.bi
 
 - [@huth2004logic]
 
+## Теория типов
+
+- [@github-learn-tt]
+- [@tapl]
+- [@hott]
+
 ## Базы данных
 - [@db-core]
 
diff --git a/fp.bib b/fp.bib
index 6c878b3..79c3538 100644
--- a/fp.bib
+++ b/fp.bib
@@ -6,3 +6,4 @@
 	note = {[Online; accessed 1. May 2023]},
 	url = {https://fprog.ru}
 }
+
diff --git a/pdfs/algebraofprogramming.pdf b/pdfs/algebraofprogramming.pdf
new file mode 100644
index 0000000..dff99bd
Binary files /dev/null and b/pdfs/algebraofprogramming.pdf differ
diff --git a/sf.bib b/sf.bib
index 1b2ffe0..e6d7bcb 100644
--- a/sf.bib
+++ b/sf.bib
@@ -11,3 +11,12 @@
 	month = may,
 	url = {https://softwarefoundations.cis.upenn.edu}
 }
+
+@book{algebraofprogramming,
+    author = {Bird, Richard and de Moor, Oege},
+    title = {Algebra of Programming},
+    year = {1997},
+    isbn = {013507245X},
+    publisher = {Prentice-Hall, Inc.},
+    address = {USA}
+}
diff --git a/tt.bib b/tt.bib
new file mode 100644
index 0000000..3428f5e
--- /dev/null
+++ b/tt.bib
@@ -0,0 +1,29 @@
+@misc{github-learn-tt,
+	author = {github/jozefg},
+	title = {{learn-tt}},
+	journal = {GitHub},
+	year = {2023},
+	month = may,
+	language = {english},
+	note = {[Online; accessed 4. May 2023]},
+	url = {https://github.com/jozefg/learn-tt}
+}
+
+@book{tapl,
+    author = {Pierce, Benjamin C.},
+    title = {Types and Programming Languages},
+    year = {2002},
+    isbn = {0262162091},
+    publisher = {The MIT Press},
+    edition = {1st},
+    abstract = {A type system is a syntactic method for automatically checking the absence of certain erroneous behaviors by classifying program phrases according to the kinds of values they compute. The study of type systems -- and of programming languages from a type-theoretic perspective -- has important applications in software engineering, language design, high-performance compilers, and security.This text provides a comprehensive introduction both to type systems in computer science and to the basic theory of programming languages. The approach is pragmatic and operational; each new concept is motivated by programming examples and the more theoretical sections are driven by the needs of implementations. Each chapter is accompanied by numerous exercises and solutions, as well as a running implementation, available via the Web. Dependencies between chapters are explicitly identified, allowing readers to choose a variety of paths through the material.The core topics include the untyped lambda-calculus, simple type systems, type reconstruction, universal and existential polymorphism, subtyping, bounded quantification, recursive types, kinds, and type operators. Extended case studies develop a variety of approaches to modeling the features of object-oriented languages.},
+}
+
+@book{hott,
+  author =    {The {Univalent Foundations Program}},
+  title =     {Homotopy Type Theory: Univalent Foundations of Mathematics},
+  url = {https://homotopytypetheory.org/book},
+  publisher = {\url{https://homotopytypetheory.org/book}},
+  address =   {Institute for Advanced Study},
+  year =      2013
+}