“Pengaruh Limbah Sawit dan NPK terhadap Hasil Pakcoy (Brassica rapa subsp chinensis) menggunakan Media Tanah Berpasir: The Effect of Palm Oil Waste and NPK on Pakcoy (Brassica rapa subsp chinensis) Results Using Sandy Soil Media” (2024) Jurnal Hortikultura Indonesia (JHI), 15(2), pp. 91–99. doi:10.29244/jhi.15.2.91-99.