nuryati, Yati, et al. “Dampak Penerapan Harga Acuan Pembelian (HAP) Gula Di Tingkat Eceran Terhadap Harga Gula Petani Dan Stabilitas Harga Gula”. Buletin Ilmiah Litbang Perdagangan, vol. 13, no. 1, July 2019, pp. 137-62, https://jurnal.kemendag.go.id/index.php/bilp/article/view/354.