Venema, Dennis. "Theory, Prediction and Converging Lines of Evidence, Part 2"
https://biologos.org/. N.p., 22 Mar. 2012. Web. 23 January 2019.
Venema, D. (2012, March 22). Theory, Prediction and Converging Lines of Evidence, Part 2
Retrieved January 23, 2019, from /blogs/dennis-venema-letters-to-the-duchess/theory-prediction-and-converging-lines-of-evidence-part-2
Meredith, R.W., Gatesy, J., Cjeng, J., and Springer, M.S. (2011). Pseudogenization of the tooth gene enamelysin (MMP20) in the common ancestor of extant baleen whales. Proceedings of the Royal Society B: 278 (1708); 993 – 1002. Available online: http://rspb.royalsocietypublishing.org/content/early/2010/09/16/rspb.2010.1280.full.pdf
Ridewood, W.G. (1923). Observations on the skull in foetal specimens of whales of the genera Megaptera and Balaenoptera. Philosophical Transactions of the Royal Society of London B: 211; 209 - 272. Available online: http://rstb.royalsocietypublishing.org/content/211/382-390/209.full.pdf