Sahrir, M.S. bin et al. 2018. Development and Evaluation of i-Mutawwif: A Mobile Language Traveller Guide in Arabic for Mutawwif (Umrah Tour Guide). International Journal of Interactive Mobile Technologies (iJIM). 12, 2 (Mar. 2018), pp. 54–68. DOI:https://doi.org/10.3991/ijim.v12i2.7708.