Dyere, Everett D., author
McGraw-Hill, 1979
Buku Teks
Casper, Lynne M., author
Sage, 2000
Buku Teks
Dolbeare, Kenneth M., author
D.C. Heath, 1985
Buku Teks
Martin, Jay, author
Prentice-Hall, 1967
Buku Teks
David, Kingley, author
Rinehart, 1951
Buku Teks