Kothari, Ashish M.
Universities Press, 2007
Buku Teks
Walters, Martin
Miles Kelly, 2000
Buku Referensi
McClure, H. Elliott (Howe Elliott), 1910-
SEATO, 1974
Buku Teks
McClure, H. Elliott (Howe Elliott), 1910-
Applied Scientific Research Corporation, [date of publication not identified]
Buku Referensi
Audubon, John James
Macmillan, 1985
Buku Referensi