1. https://www.motherlylove.co.uk/the-importance-of-massaging-the-perineum-in-pregnancy/
2. https://theconversation.com/what-we-know-about-perineal-tearing-and-how-to-reduce-it-during-childbirth-6321
3. https://www.vaginacoach.com/blogs/news/15058045-5-tips-for-perineal-healing-postpartum
4. https://www.ncbi.nlm.nih.gov/pubmed/1130098
5. https://www.bellybelly.com.au/pregnancy/perineal-massage/
6. https://www.beingtheparent.com/relaxin-hormone-during-pregnancy/
7. https://www.ncbi.nlm.nih.gov/pubmed?term=16437520
8. https://www.ncbi.nlm.nih.gov/pubmed/1007613
9. https://www.ncbi.nlm.nih.gov/pubmed?term=1643752
10. https://www.ncbi.nlm.nih.gov/pubmed?term=16437520
11. https://www.cochrane.org/CD005123/PREG_antenatal-perineal-massage-for-reducing-perineal-trauma
12. https://www.ncbi.nlm.nih.gov/pubmed/2960758
13. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1403252/
14. https://www.ncbi.nlm.nih.gov/pubmed/1007613
15. https://extranet.who.int/rhl/topics/preconception-pregnancy-childbirth-and-postpartum-care/care-during-childbirth/care-during-labour-2nd-stage/who-recommendation-techniques-preventing-perineal-trauma-during-labour