Correa Samaniego, C. A., Montalván Manzanillas, C. L., & Plaza Zambrano, A. F. (2014). English language proficiency according to the common European framework of reference CERF of second year's students of Ismael Pérez Pazmiño high school in Machala city, in the school year 2014 - 2015.
Chicago Style (17. basım) AtıfCorrea Samaniego, Cristhian Alejandro, Carlos Luis Montalván Manzanillas, ve Argenis Fernando Plaza Zambrano. English Language Proficiency According to the Common European Framework of Reference CERF of Second Year's Students of Ismael Pérez Pazmiño High School in Machala City, in the School Year 2014 - 2015. 2014.
MLA (9th ed.) AtıfCorrea Samaniego, Cristhian Alejandro, et al. English Language Proficiency According to the Common European Framework of Reference CERF of Second Year's Students of Ismael Pérez Pazmiño High School in Machala City, in the School Year 2014 - 2015. 2014.