Cita APA (7th ed.)

Worthington, C. E., Dryden, T. J., & Chauner, D. M. (1997). Healthy aging: Inspirational letters from Americans. Rutledge Books.

Cita Chicago (17th ed.)

Worthington, Carolyn E., Thomas J. Dryden, i David M. Chauner. Healthy Aging: Inspirational Letters from Americans. Bethel, CT: Rutledge Books, 1997.

Cita MLA (8th ed.)

Worthington, Carolyn E., et al. Healthy Aging: Inspirational Letters from Americans. Rutledge Books, 1997.