Cotton, P. B. (1973). Fibreoptic endoscopy and the barium meal--results and implications.
शिकागो स्टाइल उद्धरणCotton, P B. Fibreoptic Endoscopy and the Barium Meal--results and Implications. 1973.
एमएलए उद्धरणCotton, P B. Fibreoptic Endoscopy and the Barium Meal--results and Implications. 1973.
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