APA (7th ed.) Citation

Purdue Research Foundation, Tiffin, J., Lawshe, C. H., & Owen, H. F. (1942). Purdue vocational series.

Chicago Style (17th ed.) Citation

Purdue Research Foundation, Joseph Tiffin, C. H. Lawshe, and Halsey F. Owen. Purdue Vocational Series. 1942.

MLA (9th ed.) Citation

Purdue Research Foundation, et al. Purdue Vocational Series. 1942.