edited by Steven J. Ross
West Sussex Wiley Blackwell, 2014
Buku Teks
Dahl, Robert A., 1915-2014, author
Ballantine Books, 1970
Buku Teks
Mauk, David, author
Routledge, 1997
Buku Teks
Boyd, Maurice
Allyn and Bacon, Inc., 1969
Buku Teks
Fox, Frank W., author
Kendall/Hunt , 1990
Buku Teks