H. L. Romero-Schmidt, A. Ortega-Rubio, and M. Acevedo-Beltran, “Reprodudive charaderistics of the black-tailed brush lizard, <i>Urosaurus nigricaudus</i> (Phrynosomatidae)”, Rev. Biol. Trop., vol. 47, no. 4, pp. 1111–1115, Dec. 1999.