Bernstein, Marver H.
Holt, Rinehart and Winston, 1960
Buku Teks
O`Connor, Robert E., author
Brooks/Cole, 1982
Buku Teks
Barth, Alan
The Viking Press, 1961
Buku Teks
Anderson, William, 1888-
Holt , 1954
Buku Teks
Reisman, George, author
Caroline House Publishers, 1979
Buku Teks