Kilpatrick, S. and E. Garrison (2012). Normal labor and delivery. Obstetrics: Normal and Problem Pregnancies. S. G. Gabbe. Philadelphia, PA, Saunders Elsevier: 267-281.
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Kilpatrick, S. and E. Garrison (2012). Normal labor and delivery. Obstetrics: Normal and Problem Pregnancies. S. G. Gabbe. Philadelphia, PA, Saunders Elsevier: 267-281.