Barnes, R. M. (1957). Work sampling (2nd ed.). John Wiley & Sons.
Chicago Style (17th ed.) CitationBarnes, Ralph Mosser. Work Sampling. 2nd ed. New York [etc.]: John Wiley & Sons, 1957.
MLA (9th ed.) CitationBarnes, Ralph Mosser. Work Sampling. 2nd ed. John Wiley & Sons, 1957.
Warning: These citations may not always be 100% accurate.