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Abdul Rahman, Shukran, Nor Diana Mohd Mahudin, Mohd Arif Shuib, Zulkarnain Ahmad Hatta, Noraida Abdul Ghani, Jasni Sulong, Intan Hashimah Mohd Hashim, and Zarina Mat Saad. Content Validation of Scales Assessing Psychological Antecedents of Crowds Among Hajj Pilgrims. 2014.

Abdul Rahman, Shukran, et al. Content Validation of Scales Assessing Psychological Antecedents of Crowds Among Hajj Pilgrims. 2014.