edited by Allison James, Jenny Hockey and Andrew Dawson
Routledge, 1997
Buku Teks
Kailash C.Baral, editor
Routledge, 2009
Buku Teks
Howard, Michael C., author
HarperCollins, 1993
Buku Teks
Bailey, Edward P., author
Charles E. Merrill, 1984
Buku Teks
edited by Jane Eldridge Miller
Routledge, 2001
Buku Referensi