Halpern, S. L. (1970). The medical clinics of North America.
Lua i Stíl Chicago (17ú heag.)Halpern, Seymour Lionel. The Medical Clinics of North America. 1970.
Lua MLA (9ú heag.)Halpern, Seymour Lionel. The Medical Clinics of North America. 1970.
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