Taylor, F. Sherwood, author
Frederick A. Praeger, , 1955
Buku Teks
editor in chief, Charles A. Ford
Encyclopedia Britannica Educational Corporation, 1969
Buku Referensi
Porter, Philip, author
Haynes, 1995
Buku Referensi
Singh, Khuswant, author
Oxford University Press, 2006
Buku Teks
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi