Abadyo, A. and Bastari, B. 2015. Estimation of ability and item parameters in mathematics testing by using the combination of 3PLM/ GRM and MCM/ GPCM scoring model. REID (Research and Evaluation in Education). 1, 1 (Jun. 2015), 55–72. DOI:https://doi.org/10.21831/reid.v1i1.4898.