diff --git a/haskell_books.bib b/haskell_books.bib
new file mode 100644
index 0000000..9d7358d
--- /dev/null
+++ b/haskell_books.bib
@@ -0,0 +1,11 @@
+@book{Hutton2016Sep,
+    author = {Hutton, Graham},
+    title = {{Programming in Haskell}},
+    journal = {Guide books},
+    year = {2016},
+    month = sep,
+    publisher = {Cambridge University Press},
+    address = {Cambridge, England, UK},
+    language = {english},
+    doi = {10.5555/3092752}
+}
diff --git a/sink.bib b/sink.bib
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--- /dev/null
+++ b/sink.bib
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+@book{Misra2023Jan,
+    author = {Misra, Jayadev},
+    title = {{Effective Theories in Programming Practice}},
+    journal = {ACM Books},
+    volume = {47},
+    year = {2023},
+    month = jan,
+    isbn = {978-1-4503-9973-9},
+    publisher = {Association for Computing Machinery},
+    address = {New York, NY, USA},
+    language = {english},
+    doi = {10.1145/3568325}
+}