APA (7 वां संस्करण) प्रशस्ति पत्र
Díaz Avalos, J. L., & Linares de Sermeño, D. (2009). A proposal to incorporate the teaching of english in public elementary school levels in El Salvador. Universidad de El Salvador.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Díaz Avalos, Jonathan Leonel, और Delurdy Linares de Sermeño. A Proposal to Incorporate the Teaching of English in Public Elementary School Levels in El Salvador. Santa Ana, El Salvador: Universidad de El Salvador, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Díaz Avalos, Jonathan Leonel, और Delurdy Linares de Sermeño. A Proposal to Incorporate the Teaching of English in Public Elementary School Levels in El Salvador. Universidad de El Salvador, 2009.
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