Banner, Michael
Cambridge Unuversity Press , 1999
Buku Teks
Lee, Simon
Oxford University Press , 1986
Buku Teks
Bonevac, Daniel
McGraw-Hill, 2002
Buku Teks
edited by Christopher W. Gowans
Routledge, 2000
Buku Teks
Thiroux, Jacques P. author
Pearson, 2015
Buku Teks