O`Keefe, Patrick, 1984-
Managing online forums: everything you need to know to create and run successful community discussion boards
American Management Association;, 2008
 eBooks
Wiedmann, Clark
Handbook of APL Programming
Petrocelli Books, 1974
 Buku Referensi
Harms, Edward
Introduction APL and computer programming
John Wiley & Sons, 1977
 Buku Teks
Pakin, Sandra
APL: a short course
Prentice-Hall, 1973
 Buku Teks
Gilman, Leonard
APL: an interactive approach
John Wiley & Sons, 1983
 Buku Teks