1. Principles and Practice of Ophthalmic Surgery;Spaeth,1944
2. Blepharoptosis;Berke;Arch Ophthalmol,1945
3. Congenital ptosis: a classification of two hundred cases;Berke;Arch Ophthalmol,1949
4. Blepharoptosis;Johnson;Int Ophthalmol Clin,1964
5. Ptosis;Beard,1976