Bendure, Glenda
Lonely Planet, 2003
Buku Teks
Wallace, Robert
Amsterdam Time Life 1974
Buku Teks
Lind, Andrew W.
University of Hawaii Press, 1955
Buku Teks
Abramson, Norman
IEEE Computer Society, 1975
Buku Teks
edited by John F. McDermott, Wen-Shing Tseng, Thomas W. Maretzki
University of Hawaii Press, 1980
Buku Teks