McGraw-Hill, 1994
Buku Teks
Seglin, Jeffrey L., 1956-, author
Amacom, 2012
Buku Teks
Beach, David P., author
Prentice-Hall, 1992
Buku Referensi
Booher, Diana
Prentice-Hall, 1991
Buku Teks
Northouse, Peter G., author
Prentice-Hall, 1985
Buku Referensi