Uli Manik, Inggrit Rita, et al. “Determinants of Anemia in Pregnant Women in Health Centre Biak City and Sumberker Regenvcy, Biak Numfor”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 6, Nov. 2015, pp. 246-54, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/4961.