Citazione Stile APA (7a Edizione)
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..
Citazione stile Chigago Style (17a edizione)
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.
Citatione MLA (9a ed.)
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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.