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