Tatik Melinda Tallulembang. “Geographic Information Systems Practice Midwife In Merauke Regency Android-Based Method Using Spherical Law of Cosines”. International Journal of Science, Technology & Management 2, no. 3 (May 27, 2021): 895-899. Accessed May 16, 2022. https://ijstm.inarah.co.id/index.php/ijstm/article/view/218.