APA (7th ed.) Citation

Flesch, R. F., & Lass, A. H. (1949). A new guide to better writing. Popular Library.

Chicago Style (17th ed.) Citation

Flesch, Rudolf Franz, and Abraham Harold Lass. A New Guide to Better Writing. New York: Popular Library, 1949.

MLA (9th ed.) Citation

Flesch, Rudolf Franz, and Abraham Harold Lass. A New Guide to Better Writing. Popular Library, 1949.