Foreman, John
T. Fisher Unwin , 1906
Buku Teks
Arcilla S.J, Jose S.
ADMU Press, 1998
Buku Teks
Scott, William Henry, author
New Day Publishers, 1982
Buku Teks
Davis, William G.
University of California Press, 1973
Buku Teks
edited by Gordon Greenwood
Angus and Robertson, 1955
Buku Teks