Fall, Bernard B.
Doubleday, 1967
Buku Teks
Souter, Gerry, author
Andre Deutsch, 2015
Buku Referensi
editor in chief, Stanley I. Kutler
Charles Scribner's Sons, 1996
Buku Referensi
Macmillan Digital USA, 1995
Multimedia
Thompson, W. Scott (Willard Scott), 1942-, author
University of Queensland Press, 1977
Buku Teks