Kohl Coston, Phyllis (2013). Celebration of Success. Bloomington, Indiana: AuthorHouse. p. 26. ISBN9781491802311. Consultado el 2 de septiembre de 2014. «[Allison] and Evan believe this kind of planning teaches responsibility and consideration for others as well as helping the boys learn life skills such as time management, the importance of being a team member, and ownership of calendar details.»
Compare some aspects of hunter-gatherer society:
Lee, Richard B. (1998). «What hunters do for a living, or, how to make out on scarce resources». En Gowdy, John, ed. Limited Wants, Unlimited Means: A Reader On Hunter-Gatherer Economics And The Environment. Island Press. p. 52. ISBN9781559635554. Consultado el 9 de septiembre de 2014. «The hunters[' ...] schedule is uneven. it is not unusual for a man to hunt avidly for a week and then do no hunting at all for two or three weeks. Since hunting is an unpredictable business and subject to magical control, hunters sometimes experience a run of bad luck and stop hunting for a month or longer. During these periods, visiting, entertaining, and especially dancing are the primary activities of men.»