Cita APA (7a ed.)

Ryff, C. D., & Singer, B. H. (2000). Biopsychosocial challenges of the new millennium. [s.n.].

Cita Chicago Style (17a ed.)

Ryff, Carol D., y Burton H. Singer. Biopsychosocial Challenges of the New Millennium. [S.l.]: [s.n.], 2000.

Cita MLA (9a ed.)

Ryff, Carol D., y Burton H. Singer. Biopsychosocial Challenges of the New Millennium. [s.n.], 2000.