APA (7th ed.) Citation
Helliwell, J., & et al. (2016). World Happiness Report 2016. Volume I (update) and volume II (Special Rome edition). Sustainable Development Solutions Network.
Chicago Style (17th ed.) Citation
Helliwell, J., and et al. World Happiness Report 2016. Volume I (update) and Volume II (Special Rome Edition). New York: Sustainable Development Solutions Network, 2016.
MLA (9th ed.) Citation
Helliwell, J., and et al. World Happiness Report 2016. Volume I (update) and Volume II (Special Rome Edition). Sustainable Development Solutions Network, 2016.
Warning: These citations may not always be 100% accurate.