Novia, Shanti, et al. “Persepsi Pelaku UMKM Kopi Bubuk Terhadap Sertifikasi Produk Di Kabupaten Lampung Barat”. Jurnal Kompetitif Bisnis, vol. 1, no. 9, Dec. 2022, p. 11, https://www.jkb.fisip.unila.ac.id.121-50-32-50.cpanel.site/index.php/jkb/article/view/208.