APA (7th ed.) Citation

Bergener, M., Ermini, M., & Stähelin, H. B. (1988). Crossroads in aging. Academic.

Chicago Style (17th ed.) Citation

Bergener, M., M. Ermini, and H. B. Stähelin. Crossroads in Aging. London ; San Diego: Academic, 1988.

MLA (9th ed.) Citation

Bergener, M., et al. Crossroads in Aging. Academic, 1988.