Craig Haen, editor
Routledge, 2011
Buku Teks
Johnson, James H., author
Allyn and Bacon, 1997
Buku Teks
Ross, Alan O.
John Wiley & Sons, 1981
Buku Teks
edited by Monica Lanyado and Ann Horne
Routledge, 2006
Buku Teks
Semrud-Clikeman, Margaret, author
Allyn and Bacon, 1995
Buku Teks