References
Eckert, P. (2005) http://www.stanford.edu/~eckert/vowels.html. Date accessed: Nov. 25, 2011.
Labov, W., Ash, S. and Boberg, C. (2006) The Phonological Atlas of North America. Mouton de Gruyter.
Reed, C. (1952) The pronunciation of English in the state of Washington. American Speech, 27(3): 186-189.
