David Byrne and Thom Yorke on the Real Value of Music // Wired, December 18, 2007.
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Согласно пресс-релизам NPD Group. См., например: iTunes Continues to Dominate Music Retailing (от 18.09.2012).
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Раздел главы основан на исследовании: Anita Elberse, Brett Laffel. Major League Baseball Advanced Media: America’s Pastime Goes Digital // Harvard Business School, case 510–092.
