Fox, Harrison W.
The Free Press, 1977
Buku Teks
Greenwood Press, 1981
Buku Teks
Robinson, James A, author
The Bobbs-Merrill Company,Inc., 1963
Buku Teks
Deschler, Lewis
Government Printing Office, 1967
Buku Teks
Burdette, Franklin L., author
Princeton, Princeton University Press
Buku Teks