Huntington, Samuel P., author
Vakils Feffer and Simons Private, 1968
Buku Teks
Huntington, Samuel P., author
Rajawali, 1983
Buku Teks
Curtis, Sarah, author
Edward Arnold, 1996
Buku Teks
edited by Peter G. Gowing and William Henry Scott
New day, 1971
Buku Teks
Orum, Anthony M., author
Rowman & Littlefield Publishers, 1999
Buku Teks