Organisation for Economic Co-operation and Development, Centre for Educational Research and Innovation, & ProQuest (Firm). (2007). Giving knowledge for free: The emergence of open educational resources. Organisation for Economic Co-operation and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Organisation for Economic Co-operation and Development, Centre for Educational Research and Innovation, و ProQuest (Firm). Giving Knowledge for Free: The Emergence of Open Educational Resources. [Paris, France?]: Organisation for Economic Co-operation and Development, 2007.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Organisation for Economic Co-operation and Development, et al. Giving Knowledge for Free: The Emergence of Open Educational Resources. Organisation for Economic Co-operation and Development, 2007.