Dobelstein, Andrew W., author
Wadsworth, 2003
Buku Teks
Weinberger, Paul E., author
Macmillan, 1974
Buku Teks
Trattner, Walter I., author
Free Press, 1984
Buku Teks
Trattner, Walter I., author
Free Press, 1979
Buku Teks
Zastrow, Charles, author
Brooks/Cole, 1996
Buku Teks