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C++
cppreference (March 2018)
cplusplus.com (February 2018)
Python
Python Reference (3.11.2)
Python Cheat Sheet
Java
Java Platform, Standard Edition & Java Development Kit Version 9 API Specification
C
C Reference from cppreference (March 2018)
C Reference Card
Haskell
Basic Haskell Cheat Sheet
Haskell Cheat Sheet