edited by Abdel M. Agami
Random House, 1989
Buku Referensi
Westminter, Maryland Random Haouse Inc. 1989,
Buku Teks
edited by W.A. Paton
Ronald Press, 1955
Buku Teks
Kohler, Eric L., author
Prentice-Hall, 1957
Buku Referensi
edited by Marie Louise Sorensen and Dacia Viejo Rose
Cambridge University Press, 2015
Buku Teks