V. Labrada-Martagón, D. Aurioles-Gamboa, and S. F. Martínez-Díaz, “Natural and human disturbance in a rookery of the California sea lion (<i>Zalophus californianus californianus</i>) in the Gulf of California, Mexico”, Lat. Am. J. Aquat. Mamm., vol. 4, no. 2, pp. 175-185, Dec. 2005.