Morris, I. (1949). English by stages: A graduated course for the learning of English as a second language (Pupil's ed.). Macmillan.
Chicago-Zitierstil (17. Ausg.)Morris, Isaac. English by Stages: A Graduated Course for the Learning of English as a Second Language. Pupil's ed. London: Macmillan, 1949.
MLA-Zitierstil (9. Ausg.)Morris, Isaac. English by Stages: A Graduated Course for the Learning of English as a Second Language. Pupil's ed. Macmillan, 1949.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.