Cita APA (7a ed.)

Lefrançois, R., Leclerc, G., & Poulin, N. (1998). Predictors of activity involvement among older adults. [s.n.].

Cita Chicago Style (17a ed.)

Lefrançois, Richard, Gilbert Leclerc, y Norman Poulin. Predictors of Activity Involvement Among Older Adults. [S.l.]: [s.n.], 1998.

Cita MLA (9a ed.)

Lefrançois, Richard, et al. Predictors of Activity Involvement Among Older Adults. [s.n.], 1998.