Hill, N., Slattery, J., & Sartwell, M. (2011). Napoleon Hill's keys to success: The 17 principles of personal achievement. Brilliance Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHill, Napoleon, Joe Slattery, और Matthew Sartwell. Napoleon Hill's Keys to Success: The 17 Principles of Personal Achievement. Grand Haven, MI: Brilliance Audio, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHill, Napoleon, et al. Napoleon Hill's Keys to Success: The 17 Principles of Personal Achievement. Brilliance Audio, 2011.
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