This article is from the Amiga Books FAQ, by Marc Atkin with numerous contributions by others.
o Robin Evans: ARexxGuide 2.0a 1994. (no ISBN, published via shareware) $15 (suggested shareware fee)
This is a complete ARexx reference guide in AmigaGuide format. It is available from Aminet ( util/rexx/ARexxGuide2_0A.lha ).
From the "readme file": ARexxGuide is a complete ARexx reference with tutorials and dozens of ready-to-use examples. Done in AmigaGuide format, it includes argument templates and descriptions of all instruction keywords, of built-in functions, and of the functions in rexxsupport.library. The basic elements of the language are fully explained. Example programs some of them interactive answer frequently-asked questions about the language. Sample clauses are included with each function and instruction explanation. Error codes and possible solutions are explained. A help-system that will turn nearly any text editor into an online reference to ARexx is included. Working macros for three editors are provided as examples. A step-by-step tutorial explains the simple steps for making a new macro for a different editor.
o William S. Hawes: Arexx User's Reference Manual [publisher?], 1987. [ISBN?] $49.95