Dyfyniad APA

Lewis, T. L. T., & Chamberlain, G. (1990). Obstetrics by ten teachers (Fifteenth edition.). Edward Arnold.

Dyfyniad Arddull Chicago

Lewis, T. L. T., and Geoffrey Chamberlain. Obstetrics by Ten Teachers. Fifteenth edition. London Melbourne: Edward Arnold, 1990.

Dyfyniad MLA

Lewis, T. L. T., and Geoffrey Chamberlain. Obstetrics by Ten Teachers. Fifteenth edition. Edward Arnold, 1990.

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