Noorhidayah, Ratri, Muhammad Bachtiar Musthafa, and Sisno. 2021. “Fourier Transform Infrared (FTIR) Spectroscopy of Humic Acid from Chicken Manure Compost With Different Biodecomposers: Spectroskopi Fourier Transform Infrared (FTIR) Asam Humat Dari Kompos Kotoran Ayam Dengan Biodekomposer Berbeda”. Jurnal Ilmu Tanah Dan Lingkungan 23 (1). https://journal.ipb.ac.id/index.php/jtanah/article/view/33541.