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ANSI X3J18
Standard for "Programming Language REXX"
CGI Scripts in REXX and Perl
A guide by Les Cottrell.
IBM BookManager BookServer Library
All IBM Rexx manuals and redbooks.
IBM Redbooks
Search results for REXX.
Jim Barry's Rexx Tutor
Base on author training course at Computer Associates Training centre in Slough.
Kilowatt Software: Classic Rexx Tutorial
Detailed language introduction.
Rex Swain's REXX Summary
Summary of REXX Functions, Syntax, Symbols, Operators, and Instructions
Rexx FAQ
By Dave Martin.
SAA CPI REXX Level 2 Reference
Old manual defining Rexx in the context of Systems Application Architecture.
Six Rules of Thumb for Rexx
This article gives six "rules of thumb" that should help get started in REXX if you already know C or Pascal (or, really, any of the children of Algol).