Faiz, Charis Al, and Nantil Bambang Eko Sulistyono. 2019. “Pemberian H2SO4 Dan Ekstrak Bawang Merah Terhadap Uji Vigor Benih Kopi Robusta (Coffea robustaL.)”. Agriprima : Journal of Applied Agricultural Sciences 3 (1). Jember, ID:71-80. https://doi.org/10.25047/agriprima.v3i1.101.