Gordon Martel
Wiley Blackwell, 2010
Buku Teks
Hamid Basyaib, author
Lentera, 1989
Buku Teks
Gray, Colin S., author
Routledge, 2012
Buku Teks
McWilliams, Wayne C., author
Adamantine Press, 1990
Buku Teks
Jackson, J. Hampden
Hougton Mifflin Company, 1956
Buku Teks