Cita APA (7a ed.)

Beats, B., & Levy, R. (1992). Learned helplessness and decreased social interaction in ederly disabled person. [s.n.].

Cita Chicago Style (17a ed.)

Beats, Barbara, y Raymond Levy. Learned Helplessness and Decreased Social Interaction in Ederly Disabled Person. [S.l.]: [s.n.], 1992.

Cita MLA (9a ed.)

Beats, Barbara, y Raymond Levy. Learned Helplessness and Decreased Social Interaction in Ederly Disabled Person. [s.n.], 1992.