Kim, Hyunji, et al. “DIFFERENTIAL EXPRESSION OF NITRIC OXIDE SYNTHASES IN THE SKIN TISSUE OF P-PHENYLENEDIAMINE-TREATED MICE”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 8, no. 8, Aug. 2015, pp. 212-5, https://www.journals.innovareacademics.in/index.php/ijpps/article/view/6903.