White, James E.
Wadsworth and Cengage Learning, 2012
Buku Teks
edited by Christopher W. Gowans
Routledge, 2000
Buku Teks
Markham, Ian S.
Blackwell, 2007
Buku Teks
Banner, Michael
Cambridge Unuversity Press , 1999
Buku Teks
Altman, Matthew C
John Wiley & Sons, 2014
Buku Teks