Alfredo Gutiérrez, A. G. R., C. Sánchez, and G. D. Mendoza. “Effect of Including Herbal Choline in the Diet of a Dairy Herd; A Multiyear Evaluation”. Emirates Journal of Food and Agriculture, vol. 31, no. 6, Aug. 2019, pp. 477-81, doi:10.9755/ejfa.2019.v31.i6.1971.