MacCorkle, Stuart A.
D.C. Heath and Company, 1948
Buku Teks
The International City Manager's Association, 1950
Buku Teks
The International City Manager's Association, 1947
Buku Teks
OConnor, Karen
Addison Wesley Longman, 2001
Buku Teks
Aranson, Peter H.
Winthrop, 1981
Buku Teks