Gretton, G. H., & Gretton, W. (1960). German by yourself: A quick course in reading for adult beginners and others (Rev. ed, reprinted.). Bell.
Chicago-Zitierstil (17. Ausg.)Gretton, George Hermann, und Wanda Gretton. German by Yourself: A Quick Course in Reading for Adult Beginners and Others. Rev. ed, reprinted. London: Bell, 1960.
MLA-Zitierstil (9. Ausg.)Gretton, George Hermann, und Wanda Gretton. German by Yourself: A Quick Course in Reading for Adult Beginners and Others. Rev. ed, reprinted. Bell, 1960.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.