Nuryawan, A., I. Risnasaril, and S. Simarmata. “PROFIL INDUSTRI KAYU SEKUNDER DI KOTA MEDAN”. Jurnal Teknik Industri Universitas Bung Hatta, vol. 1, no. 2, Jan. 2014, pp. 128 -40, https://ejurnal.bunghatta.ac.id/index.php/JTI-UBH/article/view/2250.