Healthline. https://www.healthline.com/health/pregnancy/complications-treatments#premature-labor.
Diakses pada 12 Agustus 2019Baby Center. https://www.babycenter.com/0_7-pregnancy-complications-to-watch-out-for_10316818.bc#articlesection7
Diakses pada 12 Agustus 2019Womens Health. https://www.womenshealth.gov/pregnancy/youre-pregnant-now-what/pregnancy-complications
Diakses pada 12 Agustus 2019