APA (7th ed.) Citation

Achenbaum, W. A. (1995). Crossing frontiers: Gerontology emerges as a science. Cambridge University Press.

Chicago Style (17th ed.) Citation

Achenbaum, W. Andrew. Crossing Frontiers: Gerontology Emerges as a Science. Cambridge ; New York, NY, USA: Cambridge University Press, 1995.

MLA (9th ed.) Citation

Achenbaum, W. Andrew. Crossing Frontiers: Gerontology Emerges as a Science. Cambridge University Press, 1995.