Heiland, R. E., & Richardson, W. (1957). Work sampling. McGraw-Hill.
Chicago Style (17th ed.) CitationHeiland, Robert E., and W.J Richardson. Work Sampling. McGraw-Hill, 1957.
MLA (8th ed.) CitationHeiland, Robert E., and W.J Richardson. Work Sampling. McGraw-Hill, 1957.
Warning: These citations may not always be 100% accurate.