El-Zonkorany, Thoria Ahmed, Azza E.A. Hassan, Samah M. Mosad, Sara T. Elazab, and Magdy S. Amer. 2023. “Immunomodulating Effect of Echinacea and Star Anise in Protection and Treatment of Infectious Bronchitis Virus in Poultry”. Journal of Advanced Veterinary Research 13 (7):1359-67. https://advetresearch.com/index.php/AVR/article/view/1417.