Poracova, J., M. Blascakova, I. Salamon, and M. Zahatnanska. “SECONDARY METABOLITES OF THE SELECTED SPECIES OF MEDICINAL PLANTS IN THE RELATION TO THE PRODUCTIVE PARAMETERS OF LAYING HENS”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 6, May 2009, pp. 473-4, https://journals.athmsi.org/index.php/ajtcam/article/view/923.