1. G. Unwin, S. P. Unwin and D. H. Tucker, "History of Publishing," Encyclopædia Britannica, inc., 8 March 2018. [Online]. Available: https://www.britannica.com/topic/publishing. [Accessed 14 March 2018].
2. "Philosophical Transactions," 6 March 1665. [Online]. Available: http://rstl.royalsocietypublishing.org. [Accessed 28 February 2018].
3. R. K. Bluhm, "Henry Oldenburg, F. R. S. (c.1615-1677)," 1 July 1960. [Online]. Available: http://rsnr.royalsocietypublishing.org/content/15/1/183. [Accessed 28 February 2018].
4. L. R. Patterson, in Copyright in Historical Perspective, Patterson, Vanderbilt Univ. Press, 1968, pp. 136-137.
5. T. Delamothe and R. Smith, "Open access publishing takes off," The BMJ, vol. 328, no. 7430, pp. 1-3, 3 January 2004.