1. Antelman, K. (2004). Do open-access articles have a greater research impact? College & Research Libraries News,65(5), 372–382.
2. BMC. (2014). BioMed Central society journals see increase in impact factors after their move to open access. Retrieved January 20, 2019, from https://www.biomedcentral.com/about/press-centre/business-press-releases/5-aug-2014.
3. Buela-Casal, G., Perakakis, P., Taylor, M., & Checa, P. (2006). Measuring internationality: Reflections and perspectives on academic journals. Scientometrics,67(1), 45–65.
4. Buela-Casal, G., Zych, I., Sierra, J. C., & Bermúdez, M. P. (2007). The internationality index of the Spanish psychology journals. International Journal of Clinical and Health Psychology,7(3), 899–910.
5. Busch, S. (2014). The impact factor of journals converting from subscription to open access. Retrieved November 6, 2014, from https://blogs.biomedcentral.com/bmcblog/2014/11/06/the-impact-factor-of-journals-converting-from-subscription-to-open-access/.