Tarihoran, D., and A. Manaf. “Studi Efek Bentuk Butiran Ukuran Bervariasi Terhadap Sifat Kemagnetan Magnet Permanen”. Indonesian Journal of Physics, Vol. 13, no. 3, Oct. 2016, pp. 159-61, https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/55.