APA (7th ed.) Citation

Clark, T. N., & Lipset, S. M. (1991). Are social classes dying. International sociology, 6(4), 387-396.

Chicago Style (17th ed.) Citation

Clark, Terry Nichols, and Seymour Martin Lipset. "Are Social Classes Dying." International Sociology 6, no. 4 (1991): 387-396.

MLA (9th ed.) Citation

Clark, Terry Nichols, and Seymour Martin Lipset. "Are Social Classes Dying." International Sociology, vol. 6, no. 4, 1991, pp. 387-396.