Sitinjak, Rasmi, Rolan Siregar, and Theodora MV Naingolan. 2022. “RESPON LAMA PERENDAMAN ZAT PENGATUR TUMBUH GIBERELIN DAN PUPUK NPK TERHADAP PERTUMBUHAN BIBIT KOPI ARABIKA (Coffea arabika.L)”. Fruitset Sains : Jurnal Pertanian Agroteknologi 10 (05):301-10. https://www.ejournal.iocscience.org/index.php/Fruitset/article/view/3305.