Hall, Donald R.
Arizona The University of Arizona Press, 1970
Buku Teks
Rothenberg, Lawrence S., author
Cambridge University Press, 1992
Buku Teks
Alexander, Robert M., 1972-, author
Thomson/Wadsworth, 2006
Buku Teks
Peterson, Christian Philip, author
Routledge, 2012
Buku Teks
Matthews, Donald R.
The University of North Carolina Press, 1960
Buku Teks