APA (7th ed.) Citation

Gretton, G. H., & Gretton, W. (1940). German by yourself: A quick course in reading for adult beginners and others (3. impr.). Bell.

Chicago Style (17th ed.) Citation

Gretton, George Hermann, and Wanda Gretton. German by Yourself: A Quick Course in Reading for Adult Beginners and Others. 3. impr. London: Bell, 1940.

MLA (9th ed.) Citation

Gretton, George Hermann, and Wanda Gretton. German by Yourself: A Quick Course in Reading for Adult Beginners and Others. 3. impr. Bell, 1940.