GNU COBOL Programmers Guide For Ver 2.1 – Gary L. Cutler – 1st Edition

“This document describes the syntax, semantics, and usage of the COBOL programming language as implemented by the current version of GNU COBOL, formerly known as OpenCOBOL.

The main developers of GNU COBOL are Keisuke Nishida and Roger While. This document was designed to serve as a full-featured reference and user guide suitable for both readers learning COBOL for the first time and those already familiar with some dialect of the COBOL language.”