Những việc nên làm sau khi sinh – Giai đoạn xổ nhau thai
- Heidi Murkoff Sharon Mazel, 2008, What to expect when you’re expecting, 4th edition, Workman Publishing, USA. Page 397 – 398
- Third stage of labour, && https://www.nct.org.uk/birth/third-stage-labour
- The stages of labor, && http://www.babycenter.com/stages-of-labor
- Stages and Phases of Labor: Early, Active, and Transitional, http://www.whattoexpect.com/pregnancy/labor-and-delivery/childbirth-stages/three-phases-of-labor.aspx