APA (7th ed.) Citation

Riker, T., & Roberts, R. (1979). The directory of natural and health foods: Sourcebook for a dietary revolution. Putnam.

Chicago Style (17th ed.) Citation

Riker, Tom, and Richard Roberts. The Directory of Natural and Health Foods: Sourcebook for a Dietary Revolution. New York: Putnam, 1979.

MLA (9th ed.) Citation

Riker, Tom, and Richard Roberts. The Directory of Natural and Health Foods: Sourcebook for a Dietary Revolution. Putnam, 1979.