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Diakses pada 18 Desember 2020WebMD. https://www.webmd.com/baby/guide/bleeding-during-pregnancy#1
Diakses pada 18 Desember 2020Mayo Clinic. https://www.mayoclinic.org/symptoms/bleeding-during-pregnancy/basics/causes/sym-20050636
Diakses pada 18 Desember 2020