Kaufman, Joyce P, author
Littlefield Publishers, 2013
Buku Teks
edited by Paul K. Edwards
Blackwell , 1995
Buku Teks
Mablekos, Van E., author
Harper and Row, 1980
Buku Teks
Bierstedt, Robert, author
McGraw-Hill, 1974
Buku Teks
Curtin, Patricia A. (Patricia Ann), 1955-, author
Sage Publications, 2007
Buku Teks