Collins cortina German in 20 lessons : Intended for private study and for use in schools with a new system of simplified phonetic pronounciation based on the method illustrated of R. Diez De La Cortina - Cortina, A. Diez De La.; Lance, Eva C (New York : R. D. Cortina Inc., 1962)
This book based on the method of R. Diez De La Cortina
Keywords: German language -- Study and teaching; Language and languages; German language -- Composition and exercises