Amelia, D., I. Murni, A. Putri, J. Badri, and H. Johan. “A Study of Clothing Industry Competitiveness With Porter’s Five Force Approach in Kabupaten Agam Central Industry (A Preliminary Study of Ampek Angkek, Banuhampu, Sungai Puar)”. KnE Social Sciences, Vol. 3, no. 14, Mar. 2019, pp. 169–185, doi:10.18502/kss.v3i14.4306.