Williams, Howard
St.Maitin's Press, 1996
Buku Teks
Beitz, Charles R
Princeton University Press, 1979
Buku Teks
Knutsen, Torbjorn L.
Manchester University Press, 1992
Buku Teks
Deina Abdelkader, Nassef Manabilang Adiong, Raffaele Mauriello,
Palgrave Macmillan, 2016
Buku Teks
Kydd, Andrew H., 1963-, author
Cambridge University Press, 2015
Buku Teks