Auerbach, Alan J.
Brown & Benchmark, 1996
Buku Teks
Heyns, Roger W.
Henry Holt and Company, 1958
Buku Teks
Bass, Bernard M., editor
Allyn and Bacon, 1979
Buku Teks
Nicolson, Paula
MacMillan Education, 1986
Buku Teks
Quinn, Virginia Nichols
McGraw-Hill, 1995
Buku Teks