APA (7th ed.) Citation

Hertz, D. B., & Lesser, S. L. (1951). People in groups. Scientific American, 184, 26.

Chicago Style (17th ed.) Citation

Hertz, D. B., and S. L. Lesser. "People in Groups." Scientific American 184 (1951): 26.

MLA (9th ed.) Citation

Hertz, D. B., and S. L. Lesser. "People in Groups." Scientific American, vol. 184, 1951, p. 26.