Fitch, H.S. and Henderson, R.W. (1977)) Age and sex differences in the ctenosaur (Ctenosaura similis), Milwaukee Public Museum Contributions to Biology and Geology 11: 1-11

Fitch, H.S. and Henderson, R.W. (1977) Age and sex differences, reproduction and conservation of Igiuana iguana. Milwaukee Public Museum Contributions to Biology and Geology 13: 1-21