Sumber:

• https://www.bellybelly.com.au/birth/ecstatic-birth-natures-hormonal-blueprint-for-labor/
• http://www.childbirthconnection.org/maternity-care/role-of-hormones/
• https://chriskresser.com/natural-childbirth-iv-the-hormones-of-birth/
• https://sarahbuckley.com/pain-in-labour-your-hormones-are-your-helpers-2/