Purdue Research Foundation, Tiffin, J., Lawshe, C. H., & Owen, H. F. (1942). Purdue vocational series.
Chicago Style (17th ed.) CitationPurdue Research Foundation, Joseph Tiffin, C. H. Lawshe, and Halsey F. Owen. Purdue Vocational Series. 1942.
MLA (9th ed.) CitationPurdue Research Foundation, et al. Purdue Vocational Series. 1942.
Warning: These citations may not always be 100% accurate.