1. The Eye and its Diseases. Philadelphia and London;BEHRENS, C.,1936
2. BURNET, F. M. and WILLIAMS, S. W. (1939).-Med. Ji. of Aust., 26th year. Vol. I, No. 17, p. 637.
3. An Illustrated Guide to the Slit-lamp;BUTLER, H.,1927
4. COVERDALE, H. (1932).-New Zea. Med. Ji., Vol. XXXI, p. 207.
5. us. and New Zea;COVERDALE, H.;JI. of Surg,1938