APA (7th ed.) Citation

Walter, P. (1949). The social sciences: A problem approach. D. Van Nostrand.

Chicago Style (17th ed.) Citation

Walter, Paul. The Social Sciences: A Problem Approach. New York: D. Van Nostrand, 1949.

MLA (9th ed.) Citation

Walter, Paul. The Social Sciences: A Problem Approach. D. Van Nostrand, 1949.