Cita APA (7th ed.)

Crofton, J. W., & Douglas, A. (1981). Respiratory diseases. Blackwell Scientific.

Cita Chicago (17th ed.)

Crofton, John Wenman, i Andrew Douglas. Respiratory Diseases. Oxford: Blackwell Scientific, 1981.

Cita MLA (9th ed.)

Crofton, John Wenman, i Andrew Douglas. Respiratory Diseases. Blackwell Scientific, 1981.