Christy, George A., author
McGraw-Hill, 1960
Buku Teks
Suad Husnan, author
UPP AMP YKPN , 1996
Buku Teks
Ardhito Rusmanggala, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Graham, Benjamin, 1894-1976
HarperAudio, 2015
Buku Teks
Engel, Louis
Bantam Book, 1967
Buku Teks