Zulaikah, Siti, et al. “Magnetic Susceptibility Profile, Fe Content and PH Analysis of Apple Orchard Soil and the Relation to Fruit Diameter ”. Jurnal Penelitian Pendidikan IPA, vol. 8, no. 5, Nov. 2022, pp. 2224-8, doi:10.29303/jppipa.v8i5.2144.