Martínez, Y., R. Rodríguez, G. E. Pupo, O. Rosabal, C. Colmo, and M. Valdivié. “Phytobiotic Effect of Psidium Guajava Leaf Powder on Productivity and Quality of the Egg of Laying Hens”. Cuban Journal of Agricultural Science, vol. 54, no. 4, Dec. 2020, https://cjascience.com/index.php/CJAS/article/view/989.