Walter, P. (1949). The social sciences: A problem approach. D. Van Nostrand.
芝加哥风格引文Walter, Paul. The Social Sciences: A Problem Approach. New York: D. Van Nostrand, 1949.
MLA引文Walter, Paul. The Social Sciences: A Problem Approach. D. Van Nostrand, 1949.
警告：这些引文格式不一定是100％准确.