Siwi, C. P., and Y. Nurfirdaus. “K-MEANS CLUSTER ANALYSIS OF SUB-DISTRICTS IN SIDOARJO BASED ON LONG-TERM CONTRACEPTIVE METHOD”. Jurnal Biometrika Dan Kependudukan, vol. 9, no. 2, Oct. 2020, pp. 161-70, doi:10.20473/jbk.v9i2.2020.161-170.