Vrye toegang: Verskil tussen weergawes

<ref name="suber overview">{{cite web |last=Suber |first=Peter |title=Open Access Overview |url=http://legacy.earlham.edu/~peters/fos/overview.htm |access-date=29 November 2014 |archive-url=https://web.archive.org/web/20070519103647/http://www.earlham.edu/~peters/fos/overview.htm |archive-date=2017-05-19 |deadurl=nourl-status-live}}</ref>

<ref name="essachess">{{cite journal |last=Schöpfel |first1=Joachim |last2=Prost |first2=Hélène |year=2013 |title=Degrees of secrecy in an open environment. The case of electronic theses and dissertations |url=http://www.essachess.com/index.php/jcs/article/view/214 |journal=ESSACHESS – Journal for Communication Studies |volume=6 |issue=2(12) |pages=65–86 |archiveurl=https://web.archive.org/web/20140101042356/http://www.essachess.com/index.php/jcs/article/view/214 |archivedate=2014-01-01 |deadurl=nourl-status-live }}</ref>

<ref name="libjournal">{{cite journal |last=Schwartz |first=Meredith |year=2012 |title=Directory of Open Access Books Goes Live |journal=Library Journal |url=http://lj.libraryjournal.com/2012/04/academic-libraries/directory-of-open-access-books-goes-live/ |archiveurl=https://web.archive.org/web/20131004231707/http://lj.libraryjournal.com/2012/04/academic-libraries/directory-of-open-access-books-goes-live/ |archivedate=October 4, 2013 |deadurl=nourl-status-live }}</ref>