Stern, G.B., author
Longman, 1952
Buku Teks
Singer, Jefferson A., author
Oxford University Press, 2016
eBooks
Awuy, Tommy, author
Universitas Indonesia, 1989
UI - Skripsi (Membership)
Ross, Lillian, author
J.B. Lippincott, 1966
Buku Teks
compiled and edited by Bill Adler
Doubleday, 1966
Buku Teks