11 books in series

O'Reilly Pocket Reference

O'Reilly Pocket Reference is a 11-book series with 11 released primary works first released in 1996 with contributions by David Flanagan, Arnold Robbins, Johan Vromans, Andy Duncan, Peter Prinz, Ulla Kirch-Prinz, Kyle Loudon, Tony Stubblebine, and Michael J. Fitzgerald.

Regular expression pocket reference
vi Editor Pocket Reference
JavaScript Pocket Reference
Ruby Pocket Reference
Perl 5 Pocket Reference
Perl Pocket Reference: Programming Tools
C Pocket Reference: C Syntax and Fundamentals
JavaScript Pocket Reference: Activate Your Web Pages
C++ Pocket Reference: C++ Syntax and Fundamentals
Objective-C Pocket Reference: A Guide to Language Fundamentals
JavaScript: The Definitive Guide: Activate Your Web Pages