APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Bergener, Manfred, M. Ermini, and Hannes Stähelin. Crossroads in Aging. London ; San Diego: Academic Press, 1988.

MLA (9th ed.) Citation

Bergener, Manfred, et al. Crossroads in Aging. Academic Press, 1988.