Mujiyo, M., Sutarno, S., Suwarto, S., Budiono, R., & sutopo, novi rahmawati. (2020). Inhibiting Factors of Land Suitability for Piper nigrum L. in a Hilly Area of Tirtomoyo District, Central Java. JOURNAL OF TROPICAL SOILS, 25(1), 29–37. https://doi.org/10.5400/jts.2020.v25i1.29-37