Clark, H. F., & Crobaugh, M. (1937). Life earnings in selected occupations in the United States. Harper & Brothers.
芝加哥风格引文Clark, Harold Florian, 与 Mervyn Crobaugh. Life Earnings in Selected Occupations in the United States. New York and London: Harper & Brothers, 1937.
MLA引文Clark, Harold Florian, 与 Mervyn Crobaugh. Life Earnings in Selected Occupations in the United States. Harper & Brothers, 1937.
警告：这些引文格式不一定是100％准确.