Grey, David L.
North Western University Press, 1968
Buku Teks
Elizabeth Poole; John E. Richardson
I.B. Touris, 2006
Buku Teks
Wacks, Raymond
Oxford University Press, 2013
Buku Teks
Itule, Bruce D.
McGraw-Hill, 1994
Buku Teks
Morrison, John
Penguin Books, 1985
Buku Teks