APA (7th ed.) Citation

Bhutani, K. R., & Levin, A. B. Graceful numbers. Wiley.

Chicago Style (17th ed.) Citation

Bhutani, Kiran R., and Alexander B. Levin. Graceful Numbers. Wiley.

MLA (9th ed.) Citation

Bhutani, Kiran R., and Alexander B. Levin. Graceful Numbers. Wiley.

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