Dyfyniad APA

Ellis, R. H. (1994). The case books of Dr. John Snow. The Wellcome Trust Centre for the History of Medicine.

Dyfyniad Arddull Chicago

Ellis, R. H. The Case Books of Dr. John Snow. The Wellcome Trust Centre for the History of Medicine, 1994.

Dyfyniad MLA

Ellis, R. H. The Case Books of Dr. John Snow. The Wellcome Trust Centre for the History of Medicine, 1994.

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