L. A. Saaduldeen, E. Y. Mostafa, and S. O. Mohammad Tawfiq, “The Impact of a Proposed Strategy for Teaching Number Theory according to the Theoretical Proof Model Applied on the Achievement of Students of the College of Basic Education”, J. Tikrit U Hum., vol. 30, no. 1, 2, pp. 402–432, Jan. 2023.