Dyere, Everett D., author
McGraw-Hill, 1979
Buku Teks
Casper, Lynne M., author
Sage, 2000
Buku Teks
edited by James Ward Smith and Leland Jamison
Princeton University Press, 1961
Buku Teks
Jodidio, Philip, author
Taschen, 1997
Buku Teks
Dolbeare, Kenneth M., author
D.C. Heath, 1985
Buku Teks