– https://www.cdc.gov/reproductivehealth/contraception/index.htm
– https://dktindonesia.org/articles/mencegah-kehamilan-dengan-kontrasepsi-6-metode-kb-modern-dan-masa-perlindungannya/
– https://www.who.int/news-room/detail/23-07-2020-new-estimates-show-worldwide-fall-in-unintended-pregnancies-since-1990-1994
– https://www.womenshealth.gov/a-z-topics/birth-control-methods