Graham, Benjamin, 1894-1976
HarperAudio, 2015
Buku Teks
Ardhito Rusmanggala, author
Universitas Indonesia, 2014
UI - Skripsi Membership
Engel, Louis
Bantam Book, 1967
Buku Teks
Badger, Ralph Eastman, 1890-, author
Prentice-Hall, 1951
Buku Teks
Bellemore, Douglas H., author
South-Western Publishing, 1974
Buku Teks