Jackson, J. Hampden, author
Cambridge University Press, 1941
Buku Teks
Coon, Carleton S., author
Macmillan, 1948
Buku Teks
Durant, Ariel, author
Simon & Schuster, 1967
Buku Teks
Robertson, Arthur Henry, 1913-, author
Steven & Sons, 1956
Buku Teks
Heinz GaÌ?rtner, Adrian Hyde-Price, Erich Reite, editor
Lynne Rienner Publishers, 2000
Buku Teks