M. Lis Haryanto, R. Rufi'i, S. Sabariah, and A. Adi, “Psychometric Quality Of An Elementary School Mathematics Test: A Classical Test Theory Analysis Of Item Difficulty, Discrimination, And Distractor Functioning”, J. Penelit. Poltekbang Surabaya, vol. 11, no. 2, pp. 94–101, Aug. 2026, doi: 10.46491/jp.v11i2.2550.