Fox, Chris, author
Blackwell , 2005
Buku Teks
Jaszczolt, K. M., author
Oxford University Press, 2007
Buku Teks
Saeed, John I., author
Wiley Blackwell, 2016
Buku Teks
Palmer, F.R., author
Cambridge University Press, 1991
Buku Teks
Gregory, Howard, author
Routledge, 2000
Buku Teks