John, P., Azeem, W., Ashfaq, M., U. Khan, I., N. Razzaq, S., & Ud-Din Khan, S. (2015). Stability-indicating RP-HPLC method for simultaneous determination of methoxsalen and p-aminobenzoic acid in binary combination. Bulletin of the Chemical Society of Ethiopia, 29(1), 27–39. https://doi.org/10.4314/bcse.v29i1.3