John, P., W. Azeem, M. Ashfaq, I. U. Khan, S. N. Razzaq, and S. Ud-Din Khan. “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, no. 1 (January 18, 2015): 27–39. Accessed September 8, 2026. https://www.ajol.info/index.php/bcse/article/view/111462.