Royce, James E.
McGraw-Hill, 1961
Buku Teks
Shafie, Tun Muhammad Ghazali, author
National Archives of Malaysia, 2010
Buku Teks
edited by Charles W. Kegley
Pilgrim Press, 1994
Buku Teks
editor, Paul Boyer
Ivan R. Dee, 1900
Buku Referensi
Mehnert, Klaus
Frederick A. Praeger, 1962
Buku Teks