edited by Robert W. Kolb
Kolb Publishing, 1993
Buku Teks
Ward, Richard, author
Prentice-Hall, 1965
Buku Teks
Melvin, Michael, author
HarperCollins, 1995
Buku Teks
Nehrt, Lee Charles, author
International Textbook, 1967
Buku Teks
Nehrt, Lee Charles, author
Intext Educational, 1972
Buku Teks