Salmon, Merrilee H., author
Wadsworth, 2013
Buku Teks
Walton, Douglas, author
Cambridge University Press, 2006
Buku Teks
Foresman, Galen A., author
Wiley Blackwell, 2017
Buku Teks
Chatfield, Tom, author
Sage, 2018
Buku Teks
Rainbolt, George W., author
Wadsworth and Cengage Learning, 2012
Buku Teks