On the Southern Shift in Appalachian English. Irons, T. University of Pennsylvania Working Papers in Linguistics, 13(2):121–134, 2007.
On the Southern Shift in Appalachian English [link]Paper  bibtex   
@article{irons_southern_2007,
	title = {On the {Southern} {Shift} in {Appalachian} {English}},
	volume = {13},
	url = {https://repository.upenn.edu/pwpl/vol13/iss2/10},
	number = {2},
	journal = {University of Pennsylvania Working Papers in Linguistics},
	author = {Irons, Terry},
	year = {2007},
	pages = {121--134}
}

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