Sitanggang, Patar, Elita Tambunan, and Jane Wuisan. 2015. “UJI KEKERASAN KOMPOSIT TERHADAP RENDAMAN BUAH JERUK NIPIS (CITRUS AURANTIFOLIA)”. E-GiGi 3 (1). https://doi.org/10.35790/eg.3.1.2015.8198.