Hicks, Lanis L., author
Jones & Bartlett Learning, 2014
Buku Teks
edited by Michael Parker
Routledge , 1999
Buku Teks
Oermann, Marilyn H., author
Lippincott , 2002
Buku Teks
Bradshaw, Peter L., author
Sage, 2004
Buku Teks
Northouse, Peter G., author
Prentice-Hall, 1985
Buku Referensi