Bambang Gunawan, Nurul Huda, and Andri Mulyono. 2021. “Supplying Liquid Organic Fertilizer (POC) With Organic Waste Materials On The Growth And Product of Lettuce (Lactuca Sativa L.)”. Agricultural Science 4 (2):104-12. http://agriculturalscience.unmerbaya.ac.id/index.php/agriscience/article/view/53.