APA (7th ed.) Citation

The Reader's Digest Association Ltd. (2004). Word power builder: Improve your english as you build your vocabulary. The Reader's Digest Association.

Chicago Style (17th ed.) Citation

The Reader's Digest Association Ltd. Word Power Builder: Improve Your English as You Build Your Vocabulary. Hong Kong: The Reader's Digest Association, 2004.

MLA (9th ed.) Citation

The Reader's Digest Association Ltd. Word Power Builder: Improve Your English as You Build Your Vocabulary. The Reader's Digest Association, 2004.

Warning: These citations may not always be 100% accurate.