Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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