Ika Purnamasari, Nurkholifah Dwi Rahayu, M. Khairul Anam and Dona Wahyuning Laily 2024. Analysis of Profitability and Profit Margins of Rice-Fish Farming (Integrated Rice-Fish System) in Karangbinangun District, Lamongan Regency, East Java. Grouper. 15, 1 (Apr. 2024), 106–116. DOI:https://doi.org/10.30736/grouper.v15i1.262.