Richard Van Noorden, "Open access: The true cost of science publishing", Nature 495, 426–429 (28 March 2013) doi:10.1038/495426a Suber, Peter (2012).
2013년 11월 26일에 확인함.  Richard Van Noorden, "Open access: The true cost of science publishing", Nature 495, 426–429 (28 March 2013) doi:10.1038/495426a Suber, Peter (2012). 《Open access》.