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  1. ↑ Preston, Peter (7 Ogos 2011). "A Paywall that pays? Only in America". The Guardian. London. Dicapai pada 22 Oktober 2011.
  2. ↑ Sample, Ian (2012). "Harvard University says it can't afford journal publishers' prices" (PDF). The Guardian 24. Diarkibkan daripada yang asal (PDF) pada 2017-10-01. Dicapai pada 2020-01-23.
  3. ↑ Skirting Around Paywalls: How Scientists Quickly Get the Articles They Need
  4. ↑ Salwen, Michael B.; Garrison, Bruce; Driscoll, Paul D. (2004). Online News and the Public. Routledge. m/s. 136. ISBN 978-1-135-61679-3.
  5. ↑ "The media's". The Week. 30 July 2010.
  6. ↑ "Whoah! WSJ.com Quietly Makes Big Traffic Strides". Condé Nast. 11 April 2008. Dicapai pada 14 April 2008. No wonder Rupert Murdoch's in no hurry to do away with The Wall Street Journal's online paywall. Even with it still in place around large sections of the site, traffic is still growing at a most impressive rate.
  7. ↑ Pickard, Victor; T. Williams, Alex (2014-04-03). "Salvation or Folly? The Promises and Perils of Digital Paywalls". Digital Journalism. 2 (2): 195–213. doi:10.1080/21670811.2013.865967. Dicapai pada 2017-05-03.
  8. 1 2 Filloux, Frederick (15 Jun 2011). "Analyzing the metered model". Monday Note. Dicapai pada 13 Oktober 2011. Cite has empty unknown parameter: |dead-url= (bantuan)

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