Friedlnder, W. A., & Apte, R. Z. (1980). Introduction to social welfare (5th ed.). Prentice-Hall Inc..

Friedlnder, Walter A., and Robert Z. Apte. Introduction to Social Welfare. 5th ed. New Jersey: Prentice-Hall Inc., 1980.

Friedlnder, Walter A., and Robert Z. Apte. Introduction to Social Welfare. 5th ed. Prentice-Hall Inc., 1980.