Takayeitouw, K. K., A. L. Rantetampang, and B. Sandjaja. “Factors Affecting the Usage of Male Contraception at Waris District Sub Province of Keerom”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 36, no. 2, Oct. 2017, pp. 331-40, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8227.