1. Arthur, G.H., Noakes, D.E., Pearson, H., 1991. Reproducción y Obstetricia en Veterinaria, 6a ed. Interamericana McGraw-Hill, Madrid, España, pp. 451–454.
2. A simplified general method for cluster-sampling surveys of health in developing countries;Bennett;World Health Stat. Quart.,1991
3. Blood, D.C., Radostits, O.M., 1992. Medicina Veterinaria, 7a ed. Interamericana McGraw-Hill, Madrid, España, pp. 729–743.
4. Detección de seropositividad al virus de rinotraqueitis infecciosa bovina (IBR), en ganado del municipio de Tizimı́n, Yucatán, México;Calderon-Villagomez;Técnica Pecuaria. México,1997
5. Code of Federal Regulation, 1992. Animal and Animal Products. Cytology Section, vol. 9. Biologics Virology Laboratory, pp. 584–586.