Feldman, Robert S., author
McGraw-Hill, 1989
Buku Teks
Auerbach Alan J., author
Brown & Benchmark, 1996
Buku Teks
Heyns, Roger W.
Henry Holt and Company, 1958
Buku Teks
Bass, Bernard M., author
Allyn and Bacon, 1979
Buku Teks
Nicolson, Paula, author
MacMillan Education, 1986
Buku Teks