Mohamed Arip, Mohammad Aziz Shah. 2019. “Analysis of Validity and Reliability of Survey Self-Assessment Scale-PEER (SPKK-RS) (1 - 22)”. Jurnal Pendidikan Bitara UPSI 4 (1): 1-22. https://ejournal.upsi.edu.my/index.php/JPB/article/view/2396.