APA (7th ed.) Citation

Siegel, A. E., & Siegel, S. (1968). Reference groups, membership groups, and attitude change.

Chicago Style (17th ed.) Citation

Siegel, Alberta Engvall, and Sidney Siegel. Reference Groups, Membership Groups, and Attitude Change. 1968.

MLA (9th ed.) Citation

Siegel, Alberta Engvall, and Sidney Siegel. Reference Groups, Membership Groups, and Attitude Change. 1968.

Warning: These citations may not always be 100% accurate.