Engel, Thomas, author
Prentice-Hall, 2010
Buku Teks
Buku Teks
Carrington, Gerald, author
Oxford University Press, 1994
Buku Teks
Balzhiser, Richard E., author
Prentice Hall of India, 1977
Buku Teks
Haberman, William L., 1922-, author
Boston: Allyn and Bacon, 1980
Buku Teks