APA (7th ed.) Citation

Hankel, I. (2014). Black hole focus: How intelligent people can create a powerful purpose for their lives. Capstone, a Wiley brand.

Chicago Style (17th ed.) Citation

Hankel, Isaiah. Black Hole Focus: How Intelligent People Can Create a Powerful Purpose for Their Lives. Chichester, West Sussex, United Kingdon: Capstone, a Wiley brand, 2014.

MLA (9th ed.) Citation

Hankel, Isaiah. Black Hole Focus: How Intelligent People Can Create a Powerful Purpose for Their Lives. Capstone, a Wiley brand, 2014.