Cita APA

Pipe, A., Walker, J., & Esdaile, D. (1991). Canadian physicians and tobacco.

Chicago Style Citation

Pipe, A., J. Walker, i D. Esdaile. Canadian Physicians and Tobacco. 1991.

Cita MLA

Pipe, A., J. Walker, i D. Esdaile. Canadian Physicians and Tobacco. 1991.