Buettner, D. (2017). The blue zones of happiness: Lessons from the world's happiest people. National Geographic.
Cita Chicago Style (17a ed.)Buettner, Dan. The Blue Zones of Happiness: Lessons from the World's Happiest People. Washington, D.C.: National Geographic, 2017.
Cita MLA (8a ed.)Buettner, Dan. The Blue Zones of Happiness: Lessons from the World's Happiest People. National Geographic, 2017.
Precaución: Estas citas no son 100% exactas.