Tohutoro APA (7th ed.)
Helliwell, J., & et al. (2013). World happiness report 2013. Sustainable Development Solutions Network.
Tohutoru Kātū Chicago (17th ed.)
Helliwell, J., me et al. World Happiness Report 2013. New York: Sustainable Development Solutions Network, 2013.
Tohutoro MLA (9th ed.)
Helliwell, J., me et al. World Happiness Report 2013. Sustainable Development Solutions Network, 2013.
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