Wijanarko, A, A Taufik, and D Harnowo. “Effect of Liming, Manure, and NPK Fertilizer Application on Growth and Yield Performance of Soybean in Swamp Land”. Journal of Degraded and Mining Lands Management 3, no. 2 (February 4, 2016): 527–533. Accessed May 21, 2024. https://www.jdmlm.ub.ac.id/index.php/jdmlm/article/view/171.