APA-Zitierstil (7. Ausg.)

Stack, L. (2013). Intense focus: Where successful people get their direction. The Productivity Pro.

Chicago-Zitierstil (17. Ausg.)

Stack, Laura. Intense Focus: Where Successful People Get Their Direction. Highlands Ranch: The Productivity Pro, 2013.

MLA-Zitierstil (9. Ausg.)

Stack, Laura. Intense Focus: Where Successful People Get Their Direction. The Productivity Pro, 2013.