Open Access (OA) refers to unrestricted online access to articles published in scholarly journals and conference proceedings, and increasingly also book chapters or monographs. OA can be provided in two ways:
- Green Open Access is provided by authors self-archiving their postprints in their institutional repository or on some other OA website. Green OA journal publishers endorse immediate OA self-archiving by their authors.
- Gold Open Access is provided by authors publishing in an open access journal that provides immediate OA to all of its articles on the publisher's website. Hybrid open access journals provide Gold OA only for those individual articles for which their authors (or their author's institution or funder) pay an OA publishing fee.
- Peter Suber: Open Access Overview (definition, introduction)
- Keith G. Jeffery: Open Access: An Introduction
- Harnad, S. (2007) The Green Road to Open Access: A Leveraged Transition. In: The Culture of Periodicals from the Perspective of the Electronic Age, pp. 99-105, L'Harmattan
- Romeo registry of Journal OA Policies