APA (7th ed.) Citation

Proctor, W. M., Wrenn, C. G., & Benefield, G. R. (1931). Workbook in vocations. Houghton Mifflin company.

Chicago Style (17th ed.) Citation

Proctor, William Martin, C. Gilbert Wrenn, and Glidden Ross Benefield. Workbook in Vocations. Boston, New York [etc.]: Houghton Mifflin company, 1931.

MLA (8th ed.) Citation

Proctor, William Martin, et al. Workbook in Vocations. Houghton Mifflin company, 1931.