Cita APA (7a ed.)

Birren, J. E. (2007). Encyclopedia of gerontology. Elsevier.

Cita Chicago Style (17a ed.)

Birren, James E. Encyclopedia of Gerontology. Amsterdam [etc.]: Elsevier, 2007.

Cita MLA (9a ed.)

Birren, James E. Encyclopedia of Gerontology. Elsevier, 2007.