APA (7th ed.) Citation

RN, B. (2000). Fighting frailty. Geriatrics, 55(2), 20.

Chicago Style (17th ed.) Citation

RN, Butler. "Fighting Frailty." Geriatrics 55, no. 2 (2000): 20.

MLA (9th ed.) Citation

RN, Butler. "Fighting Frailty." Geriatrics, vol. 55, no. 2, 2000, p. 20.