- Contraception - (https://www.cdc.gov/reproductivehealth/contraception/index.htm)
- The Ovulation Method: Natural Family Planning - By John Billings - (https://www.cdc.gov/reproductivehealth/contraception/index.htm)
- A Clinical Guide for Contraception - By Leon Speroff, Philip D. Darney - (https://www.cdc.gov/reproductivehealth/contraception/index.htm)
Reference:
- Signs of Ovulation - (https://americanpregnancy.org/getting-pregnant/signs-of-ovulation/)
- Contraception - (https://www.cdc.gov/reproductivehealth/contraception/index.htm)
- The Ovulation Method: Natural Family Planning - By John Billings
- A Clinical Guide for Contraception - By Leon Speroff, Philip D. Darney
- Women's Health: A Practical Guide for Healthcare Professionals - By Sarah Bekaert
Editor: Sheela Philomena
Technical: Lingaraj