APA Edition Citation

Duke-Elder, S. (1969). The Practice of refraction (Ed.8.).

Chicago Edition Citation

Duke-Elder, Stewart. The Practice of Refraction. Ed.8. London, J & A Churchill, 1969.

MLA Edition Citation

Duke-Elder, Stewart. The Practice of Refraction. Ed.8. 1969.

Warning: These citations may not always be 100% accurate.