Widyaningrum, Widyaningrum, et al. “Portable/Handheld/NIR/Sebagai/Teknologi/Evaluasi/Mutu/Bahan/Pertanian/Secara/Non-Destruktif”. Jurnal Keteknikan Pertanian, vol. 10, no. 1, May 2022, pp. 59-68, https://doi.org/10.19028/jtep.010.1.59-68.