APL Wiki
Books and publications
Books
GraemeRobertson published two books in 2008:
A Practicle Introduction to APL1 and APL2
56 pages
£9.99
ISBN 0952416719
A Practicle Introduction to APL3 and APL4
196 pages
£29.99
ISBN 0952416727
Both can be ordered from Amazon and others. The first one can be downloaded from the APL wiki.
AjayAskoolum’s System Building with APL+WIN is available from Amazon UK
StephenTaylor is writing DBook, an introduction to APL for programmers.