APA (7th ed.) Citation

Packard, L. O., Sinnott, C. P., & Overton, B. (1933). The nations at work, an industrial and commercial geography. Macmillan.

Chicago Style (17th ed.) Citation

Packard, Leonard Oscar, Charles Peter Sinnott, and Bruce Overton. The Nations at Work, an Industrial and Commercial Geography. New York: Macmillan, 1933.

MLA (9th ed.) Citation

Packard, Leonard Oscar, et al. The Nations at Work, an Industrial and Commercial Geography. Macmillan, 1933.