Shoemaker, H. (1920). Perforated Gastric and Duodenal Ulcers.
Čikaški stil citiranjaShoemaker, Harlan. Perforated Gastric and Duodenal Ulcers. 1920.
MLA način citiranjaShoemaker, Harlan. Perforated Gastric and Duodenal Ulcers. 1920.
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