Bonevac, Daniel
McGraw-Hill, 2002
Buku Teks
White, James E.
Wadsworth and Cengage Learning, 2012
Buku Teks
Markham, Ian S.
Blackwell, 2007
Buku Teks
Banner, Michael
Cambridge Unuversity Press , 1999
Buku Teks
Thiroux, Jacques P. author
Pearson, 2015
Buku Teks