APA (7th ed.) Citation

Birkel, D. A., & Freitag, S. B. (1991). Forever fit: A step-by-step guide for older adults. Plenum Press.

Chicago Style (17th ed.) Citation

Birkel, Dee Ann, and Susan Birkel Freitag. Forever Fit: A Step-by-step Guide for Older Adults. New York: Plenum Press, 1991.

MLA (9th ed.) Citation

Birkel, Dee Ann, and Susan Birkel Freitag. Forever Fit: A Step-by-step Guide for Older Adults. Plenum Press, 1991.