APA (7th ed.) Citation

Guild, W. R., Baker, S. S., & Cowan, S. D. (1967). Vigor for men over 30: How to get in shape for life. Macmillan.

Chicago Style (17th ed.) Citation

Guild, Warren Redwood, Samm Sinclair Baker, and Stuart D. Cowan. Vigor for Men over 30: How to Get in Shape for Life. New York: Macmillan, 1967.

MLA (8th ed.) Citation

Guild, Warren Redwood, et al. Vigor for Men over 30: How to Get in Shape for Life. Macmillan, 1967.