1. H. R. Crocker(1903 ) An Analysis of Fifteen Thousand Cases of Diseases of the Skin. InDiseases of the Skin., 3rd edition. London:Lewis.
2. T. McCallAnderson(1894 ) Analysis of 10,000 Consecutive Cases of Skin Disease Met With in Hospital Practice. InDiseases of the Skin., 2nd edition. London: Charles Griffin and Co.