1. TIOBE Index http://www.tiobe.com/tiobe_index
2. American National Standards Institute American National Standard for programming languages - C New York, NY American National Standards Institute 1990
3. Bilson RC Implementing Overloading and Polymorphism in C∀ Waterloo, Canada School of Computer Science, University of Waterloo 2003 http://plg.uwaterloo.ca/theses/BilsonThesis.pdf
4. Delisle T Concurrency in C∀ Waterloo, Canada School of Computer Science, University of Waterloo 2018 https://uwspace.uwaterloo.ca/handle/10012/12888
5. C Extensions Extensions to the C language family 2014 https://gcc.gnu.org/onlinedocs/gcc-4.7.2/gcc/C-Extensions.html