1. Do open-access articles have a greater research impact?;Antelman;College and Research Libraries,2004
2. Carr, L. (2006). Access to self-archive via Google Scholar.
3. Message posted October 22, 2006, to http://listserver.sigmaxi.org/sc/wa.exe?A2=ind06&L=american-scientist-open-access-forum&D=1&O=D&F=l&S=&P=81868
4. Craig, I., Plume, A., McVeigh, M., Pringle, J., & Amin, M. (2007). Do open access articles have greater citation impact? A critical review of the literature.
5. Retrieved July 21, 2007, from http://www.publishingresearch.net/Citations-SummaryPaper3_000.pdf.pdf