Abdul Hakam, Junaidi, Bayu M Adji, and Shafira Rahmadilla Hape. “WEST SUMATRA COASTLINE CHANGE DUE TO ABRASION PROTECTION STRUCTURES: PADANG BEACH”. GEOMATE Journal, vol. 16, no. 57, Jan. 2019, pp. 170-5, https://geomatejournal.com/geomate/article/view/2864.