Cortina, R. D. d. l. (1951). French in 20 lessons, illustrated, intended for self-study and for use in schools ; with a new system of phonetic pronounciation to enable the student to speak correct French (76th ed., completely rev.). R.D. Cortina.

Cortina, Rafael Diez de la. French in 20 Lessons, Illustrated, Intended for Self-study and for Use in Schools ; with a New System of Phonetic Pronounciation to Enable the Student to Speak Correct French. 76th ed., completely rev. New York: R.D. Cortina, 1951.

Cortina, Rafael Diez de la. French in 20 Lessons, Illustrated, Intended for Self-study and for Use in Schools ; with a New System of Phonetic Pronounciation to Enable the Student to Speak Correct French. 76th ed., completely rev. R.D. Cortina, 1951.