Cita APA (7a ed.)

Harrison, T. R. (1980). Principles of internal medicine (9 ed.). McGraw - Hill Book Company.

Cita Chicago Style (17a ed.)

Harrison, T. R. Principles of Internal Medicine. 9 ed. Mexico: McGraw - Hill Book Company, 1980.

Cita MLA (9a ed.)

Harrison, T. R. Principles of Internal Medicine. 9 ed. McGraw - Hill Book Company, 1980.