Cita APA (7a ed.)
Harvard Medical School. (1990). Harvard health letter. Harvard Medical School Health Publications Group.
Cita Chicago Style (17a ed.)
Harvard Medical School. Harvard Health Letter. Boston, MA: Harvard Medical School Health Publications Group, 1990.
Cita MLA (9a ed.)
Harvard Medical School. Harvard Health Letter. Harvard Medical School Health Publications Group, 1990.
Precaución: Estas citas no son 100% exactas.