APA (7th ed.) Citation

The Reader's Digest. (1979). Reader's Digest, how to increase your word power. The reader's digest Association, Inc.

Chicago Style (17th ed.) Citation

The Reader's Digest. Reader's Digest, How to Increase Your Word Power. New York: The reader's digest Association, Inc, 1979.

MLA (8th ed.) Citation

The Reader's Digest. Reader's Digest, How to Increase Your Word Power. The reader's digest Association, Inc, 1979.