1. Idealizers and hereditary noetherian prime rings
2. L. S. Levy, and J. C. Robson, Hereditary Noetherian Prime Rings and Idealizers (American Mathematical Society, Rhode Island, US, 2010), pp. 7–21.
3. N. Jacobson, Basic Algebra II - Second Edition (W.H. Freeman and Company, New York, 2009), p. 103.
4. I. M. Isaacs, Algebra : A Graduate Course (Brooks/Cole Publisher, US, 1994), p. 3146.
5. K. Khoirunnisa, “Basic Idealizers”, Master thesis, Universitas Gadjah Mada, 2019.