Healy, Karen, author
Sage Publications, 2000
Buku Teks
Lauer, Robert H., author
Rineka Cipta, 2003
Buku Teks
Lauer, Robert H., author
Allyn and Bacon, 1982
Buku Teks
edited by Bob Pease and Jan Fook
Routledge, 1999
Buku Teks
Kirst-Ashman, Karen Kay, author
Cengage Learning , 2017
Buku Teks