Mackenzie, W.J.M.
Penguin books, 1978
Buku Teks
Sivaramakrishnan, Arvind
Texts, 2017
Buku Teks
edited by David Ingram
Blackwell , 2002
Buku Teks
Magstadt, Thomas M.
Wadsworth and Cengage Learning, 2013
Buku Teks
Tannenbaum, Donald G.
Wadsworth/Thomson learning, 2004
Buku Teks