1. Ariffin, K. (2007). Language choice and use in training sessions of selected Malaysian public organisations [Doctoral dissertation] Universiti Putra Malaysia. http://psasir.upm.edu.my/id/eprint/10328/1/FBMK_2007_11A
2. Dweik, B. S., Nofal, M. Y., & Qawasmeh, R. S. (2014). Language use and language attitudes among the Muslim Arabs of vancouver/Canada: A sociolinguistic study. International Journal of Linguistics and Communication, 2(2), 75–99.
3. Ervin-Tripp, S. (1964). An analysis of the interaction of language, topic, and listener. American Anthropologist, 66(6), 86–102.
4. Fishman, J. A. (1972). Domains and the relationship between micro-and macrosociolinguistics. Directions in Sociolinguistics: The Ethnography of Communication, 435, 453.
5. Fishman, J. A. (1965). Who speaks what language to whom and when?. La linguistique, 1(Fasc. 2), 67–88.