diff --git a/README.adoc b/README.adoc
index db1f184..312d7c1 100644
--- a/README.adoc
+++ b/README.adoc
@@ -12720,6 +12720,10 @@ The following sections are related to multithreading in userland:
 ** <<number-of-cores-in-qemu-user-mode>>
 ** <<number-of-cores-in-gem5-user-mode>>
 
+=== Userland content bibliography
+
+* The Linux Programming Interface by Michael Kerrisk https://www.amazon.co.uk/Linux-Programming-Interface-System-Handbook/dp/1593272200 Lots of open source POSIX examples: https://github.com/cirosantilli/linux-programming-interface-kerrisk
+
 == Userland assembly
 
 Programs under `userland/arch/<arch>/` are examples of userland assembly programming.