1. Butler, P.M., Acta Palaeontol. Pol., 2000, vol. 45, no. 4, pp. 317–342.
2. Kielan-Jaworowska, Z., Cifelli, R.L., and Luo, Z.-X., Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure, New York: Columbia Univ. Press, 2004.
3. Kermack, K.A., Kermack, D.M., Lees, P.M., and Mills, J.R.E., Acta palaeontol. Pol., 1998, vol. 43, no. 4, pp. 581–606.
4. Butler, P.M. and Hooker, J.J., Acta Palaeontol. Pol., 2005, vol. 50, no. 2, pp. 185–207.
5. Heinrich, W.-D., Mitt. Mus. Naturkunde Berlin. Geowissenschaftliche, 1999, vol. 2, pp. 159–170.