Krupp, M. A. (1980). Current medical diagnosis treatment 1980. Lange Medical.
Lua i Stíl Chicago (17ú heag.)Krupp, Marcus A. Current Medical Diagnosis Treatment 1980. Lange Medical, 1980.
Lua MLA (9ú heag.)Krupp, Marcus A. Current Medical Diagnosis Treatment 1980. Lange Medical, 1980.
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