Midgley, James, author
Sage Publications, 1997
Buku Teks
Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Kirst-Ashman, Karen Kay, author
Cengage Learning , 2017
Buku Teks
Kirst, Ashman Karen Kay, author
Cengage Learning, 2013
Buku Teks
edited by Thomas and Dorothy Wilson
Longman, 1991
Buku Teks