diff --git a/bibliotheca.bib b/bibliotheca.bib
index 3b7b6b3..278b1ad 100644
--- a/bibliotheca.bib
+++ b/bibliotheca.bib
@@ -7,6 +7,7 @@
 	title = "97 Things Every Programmer Should Know",
 	author = "Kevlin Henney",
 	year = "2010",
+  url = "https://97-things-every-x-should-know.gitbooks.io/97-things-every-programmer-should-know/content/en/index.html",
 }
 @book{tao1987,
 	title = "The Tao of Programming",