APA (7th ed.) Citation

Buettner, D. (2021). The Blue Zones challenge: A 4-week plan for a longer, better life. National Geographic Society.

Chicago Style (17th ed.) Citation

Buettner, Dan. The Blue Zones Challenge: A 4-week Plan for a Longer, Better Life. [Washington, D.C.]: National Geographic Society, 2021.

MLA (8th ed.) Citation

Buettner, Dan. The Blue Zones Challenge: A 4-week Plan for a Longer, Better Life. National Geographic Society, 2021.

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