FRANK, M. (1972). Modern english: Exercises for non-native speakers .. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)FRANK, Marcella. Modern English: Exercises for Non-native Speakers .. New Jersey: Prentice-Hall, 1972.
Lua MLA (9ú heag.)FRANK, Marcella. Modern English: Exercises for Non-native Speakers .. Prentice-Hall, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.