@inbook {drakopoulos2012hierarchical,
	title = {Hierarchical needs, income comparisons, and happiness levels},
	booktitle = {A positive psychology perspective on quality of life, Efklides A., Moraitou D. (eds)},
	year = {2012},
	pages = {17{\textendash}32},
	publisher = {Springer, Dordrecht},
	organization = {Springer, Dordrecht},
	author = {Drakopoulos, Stavros A}
}
