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Беседы с Т. Д. Паркером, май 2015 года.
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Charlie Connell, «Did Thomas Edison Invent the Tattoo Machine?», Inked, December 18, 2014.
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Anna Winston, «French Designers Hack a 3D Printer to Make a Tattooing Machine», Dezeen, October 28, 2014.
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Daniel E. Slotnik, «Tom Sims, Pioneer in Sport of Snowboarding, Dies at 61», The New York Times, September 18, 2012.
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Это заявление было сделано в книге Robert D. Ekelund, Robert F. Hébert, Robert D. Tollison, Gary M. Anderson, and Audrey B. Davidson, Sacred Trust: The Medieval Church as an Economic Firm (Oxford: Oxford University Press, 1996).
