Cita APA (7a ed.)

Achté, K., Malassu, P., & Saarenheimo, M. (1986). Old age and stress. [s.n.].

Cita Chicago Style (17a ed.)

Achté, Kalle, Pirjo-Leena Malassu, y Marja Saarenheimo. Old Age and Stress. [S.l.]: [s.n.], 1986.

Cita MLA (9a ed.)

Achté, Kalle, et al. Old Age and Stress. [s.n.], 1986.