Halpern, S. L. (1970). The medical clinics of North America.
Cita Chicago (17th ed.)Halpern, Seymour Lionel. The Medical Clinics of North America. 1970.
Cita MLA (9th ed.)Halpern, Seymour Lionel. The Medical Clinics of North America. 1970.
Atenció: Aquestes cites poden no estar 100% correctes.