A brief description and chronology of the APL programming language, by Jan Bakker. Includes code examples and references.
APL Programming Language
Growing article, with links to many related topics. [Wikipedia]
A brief primer for APL, A Programming Language. Includes a description, comparison with other early programming languages, and code examples.
Hello, World Program
Several variants written in APL.
JimW's APL Information
An overview of APL, information on getting started, and a large collection of APL articles and references.