Walker, B., & Smith, M. J. (1978). Upper gastrointestinal endoscopy- a survey of patients' impressions. BMJ Group.
Chicago Style aipamenaWalker, B., and M. J. Smith. Upper Gastrointestinal Endoscopy- a Survey of Patients' Impressions. BMJ Group, 1978.
MLA aipamenaWalker, B., and M. J. Smith. Upper Gastrointestinal Endoscopy- a Survey of Patients' Impressions. BMJ Group, 1978.
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