1. FAO, World reference base for soil resources 2014, (Food and Agriculture Organization of The United Nations, Italy, 2015).
2. H. Subagyo, N. Suharta, and A. B. Siswanto, Tanah-tanah pertanian di Indonesia, (Badan Penelitian dan Pengembangan Pertanian. Departemen Pertanian. Jakarta, 2000), pp 21–65.
3. N. Nilahayati, S.Safrizal, and N. N. J. Ary, Jurnal Agrium Unimal, 17: 67–73 (2020).
4. R. Sudirja, “Respons beberapa sifat kimia Inceptisol asal Rajamandala dan hasil bibit kakao melalui pemberian pupuk organik dan pupuk hayati”, Basic Research Report, Padjadjaran University, 2007.
5. Puslittanak, Atlas Sumberdaya Tanah Eksplorasi Indonesia skala 1:1.000.000, (Badan Litbang Pertanian, Bogor, 2000).