Brighton University (UK)
The APL section of "The Brighton University Resource Kit for Students". The higher levels of this site are well worth studying as well.
url: burks.bton.ac.uk/burks/language/apl/index.htm
Hello, World Program
Several variants written in APL.
url: www2.latech.edu/~acm/helloworld/apl.html
TechEncyclopedia
Many computing related definitions here
url: www.techweb.com/encyclopedia/defineterm?term=APL&a...
Why APL?
Anonymous essay from 1983 published by ACM SIGAPL, which explains the strengths of the APL approach to algorithm design.
url: www.acm.org/sigapl/whyapl.htm