Coronel, H. R. (1974). A comparative study of English and Spanish sounds and letter forms [microform]. Photoduplication Service, University of the Philippines Library.
Chicago Style (17. basım) AtıfCoronel, Hermogenes R. A Comparative Study of English and Spanish Sounds and Letter Forms [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1974.
MLA (9th ed.) AtıfCoronel, Hermogenes R. A Comparative Study of English and Spanish Sounds and Letter Forms [microform]. Photoduplication Service, University of the Philippines Library, 1974.
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