Cita APA (7th ed.)

Essex, M. (1964). The hard-hearted doctor. R. Hale.

Cita Chicago (17th ed.)

Essex, Mary. The Hard-hearted Doctor. London: R. Hale, 1964.

Cita MLA (8th ed.)

Essex, Mary. The Hard-hearted Doctor. R. Hale, 1964.