Caoili, Andrew M. <br/><br/>
English vowel sounds as produced by senior high school students / 
Andrew M. Caoili 
 - City of Batac :  MMSU,   2019 
 - xii, 86 leaves ;  28 cm. 
<br/><br/> Thesis (BA in English Language) – Mariano Marcos State University-College of Arts and Sciences, Batac City<br/> 
<br/><br/>Bibliography: leaves 55-59