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Gelber, Steven (1991). "A Job You Can't Lose: Work and Hobbies in the Great Depression". Journal of Social History. 24 (4). Oxford University Press: 741–766. doi:10.1353/jsh/24.4.741. JSTOR3788855.
etymonline.com
Douglas Harper (2001–2012). "hobby". Online Etymology Dictionary. Douglas Harper. Retrieved 5 May 2012.
Gelber, Steven (1991). "A Job You Can't Lose: Work and Hobbies in the Great Depression". Journal of Social History. 24 (4). Oxford University Press: 741–766. doi:10.1353/jsh/24.4.741. JSTOR3788855.