Cita APA (7a ed.)

Campbell, A. J., & Buchner, D. M. (1997). Unstable disability and the fluctuations of frailty. [s.n.].

Cita Chicago Style (17a ed.)

Campbell, A. John, y David M. Buchner. Unstable Disability and the Fluctuations of Frailty. [S.l.]: [s.n.], 1997.

Cita MLA (9a ed.)

Campbell, A. John, y David M. Buchner. Unstable Disability and the Fluctuations of Frailty. [s.n.], 1997.