Cita APA

Cope, G. F., & Heatley, R. V. (1992). Cigarette smoking and intestinal defences.

Citación estilo Chicago

Cope, G F., y R V. Heatley. Cigarette Smoking and Intestinal Defences. 1992.

Cita MLA

Cope, G F., y R V. Heatley. Cigarette Smoking and Intestinal Defences. 1992.