Rujukan Capaian terbuka

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  4. Schöpfel, Joachim; Prost, Hélène (2013). "Degrees of secrecy in an open environment. The case of electronic theses and dissertations". ESSACHESS – Journal for Communication Studies. 6 (2(12)): 65–86. Diarkib daripada yang asal pada 2014-01-01.
  5. Schwartz, Meredith (2012). "Directory of Open Access Books Goes Live". Library Journal. Diarkib daripada yang asal pada October 4, 2013.