Aumann, Francis R.
Thomas Y. Crowell Company, 1956
Buku Teks
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, author
Addison Wesley Longman, 2001
Buku Teks