See also:

• Computers: Parallel Computing: Programming: Languages  (34)
• Computers: Programming: Languages: Functional  (54)
• Computers: Programming: Languages: Garbage Collected: Procedural  (0)
• Computers: Programming: Languages: Interpreted: Procedural  (6)
• Computers: Programming: Languages: Multiparadigm  (20)
• Computers: Programming: Languages: Procedural  (22)

• APL Programming Language - Growing article, with links to many related topics. [Wikipedia]
• Hello, World Program - Several variants written in APL.
• Why APL? - Anonymous essay from 1983 published by ACM SIGAPL, which explains the strengths of the APL approach to algorithm design.