Using OpenMP -- The Books

Books on OpenMP, including Using OpenMP.

OpenMP 4.5 Examples Guide

OpenMP Examples guide 4.5 (PDF)

Using OpenMP -- Stack Overflow

Questions and Answers on the OpenMP specification.

OpenMP on Wikipedia

A good introduction to the concepts and features of the OpenMP API.

OpenMP Video Tutorial

A Hands-on-Introduction to OpenMP by Tim Mattson (Intel) – A video tutorial in 27 parts.