@article {drakopoulos2006conceptual,
	title = {The conceptual roots of work effort in pre-classical and classical economic thought},
	journal = {Archives of Economic History},
	volume = {18},
	number = {2},
	year = {2006},
	pages = {27{\textendash}44},
	author = {Drakopoulos, Stavros A and Karayiannis, Anastassios}
}
