Quinn, James A., author
American Book Company, 1955
Buku Teks
s.l. s.n. c.1979,
Buku Teks
Elkins, T. H., author
Macmillan, 1973
Buku Teks
Gans, Herbert J., author
The Free Press, 1982
Buku Teks
O`Sullivan, Arthur, author
Irwin McGraw-Hill, 2000
Buku Teks