Althaus, Scott L., author
Cambridge University Press, 2003
Buku Teks
Bollens, John C., author
Harper and Row, 1975
Buku Teks
Bollens, John C., author
Harper and Row, 1970
Buku Teks
edited by Matthew Carlin and Jason Wallin
Bloomsbury Academic, 2014
Buku Teks
Kohler, Littleton, author
State University , 1951
Buku Teks