@book{20011,
	author = {Caoili, Andrew M.},
	title = {English vowel sounds as produced by senior high school students /},
	publisher = {MMSU, },
	year = {2019},
	address = {City of Batac :},
	note = {Thesis (BA in English Language) – Mariano Marcos State University-College of Arts and Sciences, Batac City
}
}