Swartz MH (Ed.). 2014. The pregnant patient. Textbook of physical diagnosis: history and examination. (7th ed.)(651-670).Saunders.
Khorasanee J, Kippenhan M. 2013. The healthy pregnancy. Adams JG (Ed.) Emergency Medicine (2nd ed.)(1015-1022). Saunders.
Guidelines for perinatal care / American Academy of Pediatrics [and] the American
College of Obstetricians and Gynecologists.—7th ed.