Manullang, Y.; Herawati, R.; Handajaningsih, M.; Ganefianti, D. W.; Haquarsum, E. J.; Sutrawati, M. Growth and Yield of Lettuce (Lactuca Sativa L.) by Giving Cow Manure and Empty Palm Oil Bunch Fertilizer on Peat Soil. Akta Agrosia 2020, 23, 39-46.