Cita APA

Gabbe, S. G., Niebyl, J. R., & Simpson, J. L. 1. (2007). Obstetrics: Normal and problem pregnancies (5. edition.). Philadelphia, Pennsylvania: Churchil Livingstone.

Citación estilo Chicago

Gabbe, Steven G., Jennifer R. Niebyl, y Joe Leigh 1943- Simpson. Obstetrics: Normal and Problem Pregnancies. 5. edition. Philadelphia, Pennsylvania: Churchil Livingstone, 2007.

Cita MLA

Gabbe, Steven G., Jennifer R. Niebyl, y Joe Leigh 1943- Simpson. Obstetrics: Normal and Problem Pregnancies. 5. edition. Philadelphia, Pennsylvania: Churchil Livingstone, 2007.