APA (7th ed.) Citation

Giles, G. H. (1949). The practice of orthoptics (2nd ed. rev.). Hammond.

Chicago Style (17th ed.) Citation

Giles, George Henry. The Practice of Orthoptics. 2nd ed. rev. London: Hammond, 1949.

MLA (8th ed.) Citation

Giles, George Henry. The Practice of Orthoptics. 2nd ed. rev. Hammond, 1949.