APA (7th ed.) Citation

Hill, N., Slattery, J., & Sartwell, M. (2011). Napoleon Hill's keys to success: The 17 principles of personal achievement. Brilliance Audio.

Chicago Style (17th ed.) Citation

Hill, Napoleon, Joe Slattery, and Matthew Sartwell. Napoleon Hill's Keys to Success: The 17 Principles of Personal Achievement. Grand Haven, MI: Brilliance Audio, 2011.

MLA (8th ed.) Citation

Hill, Napoleon, et al. Napoleon Hill's Keys to Success: The 17 Principles of Personal Achievement. Brilliance Audio, 2011.

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