Adams, Thomas J.
Canfield Press, 1976
Buku Teks
George, Thomas F
Prentice-Hall, 1987
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