S. Mansour, S., and W. A. Bashir. “Spectrophotometric Assay of Thymol in Various Samples by Coupling With Diazotized P-Nitroaniline”. Rafidain Journal of Science, vol. 18, no. 1, Feb. 2007, pp. 28-37, doi:10.33899/rjs.2007.42640.