Rashed, N. S., A. M. Abdelazeem, and F. A. Fouad. “Spectrophotometric Methods for the Determination of Ceftiofur and Tulathromycin in Bulk and Dosage Forms”. Asian Journal of Applied Chemistry Research, Vol. 5, no. 1, Mar. 2020, pp. 34-47, doi:10.9734/ajacr/2020/v5i130126.