Cortina, R. D. d. l. (1974). Collins Cortina Spanish in 20 lessons: Intended for private study and for use in schools with a new system of simplified phonetic pronunciation. National Bookstore.
Chicago Style (17th ed.) CitationCortina, Rafael Diaz de la. Collins Cortina Spanish in 20 Lessons: Intended for Private Study and for Use in Schools with a New System of Simplified Phonetic Pronunciation. Manila: National Bookstore, 1974.
MLA (9th ed.) CitationCortina, Rafael Diaz de la. Collins Cortina Spanish in 20 Lessons: Intended for Private Study and for Use in Schools with a New System of Simplified Phonetic Pronunciation. National Bookstore, 1974.
Warning: These citations may not always be 100% accurate.