APA (7th ed.) Citation

Seifert, K., Hoffnung, R. J., & Hoffnung, M. (2000). Lifespan development. Houghton.

Chicago Style (17th ed.) Citation

Seifert, Kelvin, Robert J. Hoffnung, and Michele Hoffnung. Lifespan Development. Boston [u.a.]: Houghton, 2000.

MLA (9th ed.) Citation

Seifert, Kelvin, et al. Lifespan Development. Houghton, 2000.