Guzmán G., John, et al. “Evaluation of the Antigen-Antibody Complex Vaccine of Gumboro Disease Administered in Ovo in Broiler Chickens Challenged With F52 70 Strain”. Revista De Investigaciones Veterinarias Del Perú, vol. 21, no. 2, Dec. 2010, pp. 210-8, https://doi.org/10.15381/rivep.v21i2.139.