Caplan, Pat
Routledge, 1997
Buku Teks
Dia, Mamadou, author
Frederick A. Praeger, 1961
Buku Teks
Griffiths, Ieuan Ll., author
Routledge, 1994
Buku Teks
Booth, Alan R., author
Westview Press, 1983
Buku Teks
Edited by Sharon B. Stichter and Jane L. Parpart
Boulder Westview press 1988,
Buku Teks