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
Pakin, Sandra
APL: a short course
Prentice-Hall, 1973
 Buku Teks SO
Polivka, Raymond P.
APL : the language and its usage
Prentice-Hall, 1975
 Buku Teks SO
Wiedmann, Clark
Handbook of APL Programming
Petrocelli Books, 1974
 Buku Referensi
Gilman, Leonard
APL an interactive approach
John Wiley & Sons, 1976
 Buku Teks SO