Orsini, Philip S.
Gramedia Pustaka Utama, 1996
Buku Teks
Treece, Marla, author
Allyn and Bacon, 1994
Buku Teks
Griffin, Ricky W., author
Pearson Education International, 2006
Buku Teks
Griffin, Ricky W., author
Prentice-Hall, 1999
Buku Teks
Griffin, Ricky W., author
Prentice-Hall, 2002
Buku Teks