TAHIR, A.M. 2016. “Peran Polimorfisme Gen Collagen Type 1 Alpha 1 (COL1α1) Terhadap Penurunan Densitas Mineral Tulang Vertebra Lumbal Akseptor KB Suntik DMPA”. Indonesian Journal of Obstetrics and Gynecology 33 (3). https://www.inajog.com/index.php/journal/article/view/200.