APA (7 वां संस्करण) प्रशस्ति पत्र
Cortina, R. D. d. l. (1977). Conversational Spanish in 20 lessons: Intended for self-study and for use in schools : with a simplified system of phonetic pronunciation. R. D. Cortina Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Cortina, R. Diez de la. Conversational Spanish in 20 Lessons: Intended for Self-study and for Use in Schools : With a Simplified System of Phonetic Pronunciation. New York: R. D. Cortina Co., 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Cortina, R. Diez de la. Conversational Spanish in 20 Lessons: Intended for Self-study and for Use in Schools : With a Simplified System of Phonetic Pronunciation. R. D. Cortina Co., 1977.
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