1. Brodkorb, P., 1963, A giant flightless bird from the Pleistocene of Florida. Auk., 8: 111–115.
2. Hecht, M.K., 1975, The morphology and relationships of the largest known terrestrial lizard, Megalania prisca Owen, from the Pleistocene of Australia. Proc. Roy. Soc. Vict., 87:239–2L9.
3. Herrero-Ducloux, A., 1963, The Andes of western Argentina. Am. Assoc. Pet. Geol., Mem., 2: 16–28.
4. Hirschfeld, S.E. and Webb, S.D., 1968, Plio-Pleistocene megalony-
5. chid sloths of North America. Bull. Florida State Mus., Biol. Sci., 12(5):213–296.