APA (7e ed.) Bronvermelding

U.S. Bureau of Labor Statistics, Searle, A. D., & Kaplan, C. S. (1949). Major sources of productivity information.

Chicago (17e ed.) Bronvermelding

U.S. Bureau of Labor Statistics, Allan D. Searle, en Catherine S. Kaplan. Major Sources of Productivity Information. Washington, 1949.

MLA (9e ed.) Bronvermelding

U.S. Bureau of Labor Statistics, et al. Major Sources of Productivity Information. 1949.