Miller, Jamie, author
Oxford University Press, 2016
eBooks
Edited by Manuel Herz, Ingrid Schroder, Hans Focketyn, Julia Jamrozik
Park Books, 2016
Buku Teks
Bohannan, Paul, author
The National History Press, 1964
Buku Teks
Mazrui, Ali Al Amin
Little, Brown & Co., 1986
Buku Teks
Duffy, James
HArvard University Press, 1961
Buku Teks