Correa, Hector
International Textbook , 1969
Buku Teks
Brennan, Michael J., author
South-Western, 1973
Buku Teks
Bell, Colin E.
Richard D. Irwin, 1977
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 2003
Buku Teks
Bell, Collin E., author
Richard D. Irwin, 1977
Buku Teks