Cita APA (7a ed.)

Duff, S. E. (1996). A study of the effects of group family play on family relations. [s.n.].

Cita Chicago Style (17a ed.)

Duff, Shari E. A Study of the Effects of Group Family Play on Family Relations. [S.l.]: [s.n.], 1996.

Cita MLA (9a ed.)

Duff, Shari E. A Study of the Effects of Group Family Play on Family Relations. [s.n.], 1996.