Gaya APA
Buettner, Dan. (2017).
The Blue Zones of Happiness .
United States:
National Geographic Partners.
Gaya Chicago
Buettner, Dan.
The Blue Zones of Happiness.
United States:
National Geographic Partners,
2017.
Text.
Gaya MLA
Buettner, Dan.
The Blue Zones of Happiness.
United States:
National Geographic Partners,
2017.
Text.
Gaya Turabian
Buettner, Dan.
The Blue Zones of Happiness.
United States:
National Geographic Partners,
2017.
Print.