Frank, M. (1972). Modern English: Exercises for non-native speakers. Prentice-Hall.
Chicago-referens (17:e uppl.)Frank, Marcella. Modern English: Exercises for Non-native Speakers. Englewood Cliffs, N. J: Prentice-Hall, 1972.
MLA-referens (9:e uppl.)Frank, Marcella. Modern English: Exercises for Non-native Speakers. Prentice-Hall, 1972.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.