Cita APA (7a ed.)

Buchner, D. M., & Wagner, E. H. (1992). Preventing frail health. [s.n.].

Cita Chicago Style (17a ed.)

Buchner, David M., y Edward H. Wagner. Preventing Frail Health. [S.l.]: [s.n.], 1992.

Cita MLA (9a ed.)

Buchner, David M., y Edward H. Wagner. Preventing Frail Health. [s.n.], 1992.