APA (7th ed.) Citation

Leonard, S. A. (1932). Current English usage. Pub. for the National council of teachers of English, The Inland Press.

Chicago Style (17th ed.) Citation

Leonard, Sterling Andrus. Current English Usage. Chicago: Pub. for the National council of teachers of English, The Inland Press, 1932.

MLA (9th ed.) Citation

Leonard, Sterling Andrus. Current English Usage. Pub. for the National council of teachers of English, The Inland Press, 1932.