edited by Florence Howe
McGraw-Hill, 1975
Buku Teks
Kissler, Gary D., author
Addison-Wesley, 1991
Buku Referensi
Cooper, Wendy, author
Hutchinson , 1975
Buku Teks
Open University Press, 1998
Buku Teks
Dolbeare, Kenneth M., author
D.C. Heath, 1985
Buku Teks