Nasution, Amelira Haris, Ratna Winandi Asmarantaka, and Lukman M Baga. 2015. “EFISIENSI PEMASARAN GAMBIR DI KABUPATEN LIMA PULUH KOTA, SUMATERA BARAT”. Buletin Ilmiah Litbang Perdagangan 9 (2):221-39. https://jurnal.kemendag.go.id/index.php/bilp/article/view/9.