Tohutoro APA (7th ed.)
Veeger, W., & Hellemans, N. (1982). Gastroskopie. Boehringer.
Tohutoru Kātū Chicago (17th ed.)
Veeger, W., me N. Hellemans. Gastroskopie. Ingelheim: Boehringer, 1982.
Tohutoro MLA (9th ed.)
Veeger, W., me N. Hellemans. Gastroskopie. Boehringer, 1982.
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