Àmin ohùn jé àwon àmì ninú ìwé kiko ti a fi ún tokasi bí a se un pe oro . Àmin ohùn ni àwon oloyinbo ún pè ní "accent mark" tàbí "diacritic". Ìdí tí àmì ohùn se se pataki ni pe òrò méjì tàbí jubelo le ni àkotó kan, àmì ohùn ni a fi ún se iyato "Accent marks". TheFreeDictionary.com. Retrieved 2022-03-06.  Bragg, Melvyn (2003). The Adventure of English, 500AD to 2000: The Biography of a Language. London: Hodder & Stoughton. ISBN 0-340-82991-5.  Giles, H., & Coupland, N. (1991). Language: Contexts and consequences. Buckingham, UK: Open University Press. Lindemann, S. (2003). Koreans, Chinese or Indians? Attitudes and ideologies about non-native English speakers in the United States. Journal of Sociolinguistics, 7, 348–364. Lindemann, S. (2005). Who speaks “broken English”? US undergraduates’ perception of non-native English. International Journal of Applied Linguistics, 15, 187–212. Milroy, James; and Lesley Milroy (2005). Authority in Language: Investigating Standard English (3rd ed.).