1. 1F. Hebra, and C.H. Fagge, On Diseases of the Skin, including the Exanthemata . Vol. I . Translated and edited by. London: New Sydenham Society, 1866 ; 301 -11 .
2. 2H Radcliffe Crocker, Diseases of the Skin. Their Description, Pathology, Diagnosis and Treatment . London: H. K. Lewis, 1888 ; 78 -87 .
3. 3T. McCall Anderson, A Treatise on Diseases of the Skin . London: Griffin, 1887 ; 218 -26 .
4. Urticaria