Uwah, . T. O. ., E. I. Akpabio, and D. Effiong. “Plants As Pharmaceutical Excipients in Oral Sustained Drug Delivery Systems: A Review”. Journal of Applied Pharmaceutical Research, vol. 9, no. 3, Sept. 2021, pp. 26-38, doi:10.18231/j.joapr.2021.v9.i3.26-38.