Uwah, T O, E I Akpabio, and Daniel Effiong. 2021. “Plants As Pharmaceutical Excipients in Oral Sustained Drug Delivery Systems: A Review”. Journal of Applied Pharmaceutical Research 9 (3). Raipur, India:26-38. https://doi.org/10.18231/j.joapr.2021.v9.i3.26-38.