Cita APA (7a ed.)

Zigmond, A. S., & Snaith, P. (1983). The hospital anxiety and depression scale. [s.n.].

Cita Chicago Style (17a ed.)

Zigmond, A. S., y Philip Snaith. The Hospital Anxiety and Depression Scale. [S.l.]: [s.n.], 1983.

Cita MLA (9a ed.)

Zigmond, A. S., y Philip Snaith. The Hospital Anxiety and Depression Scale. [s.n.], 1983.