Gaya APA

Fowler, C., Petre, K, L. (2001). Spectacle Lenses : Theory and Practice . Oxford: Butterworth-Heinemann Ltd.

Gaya MLA

Fowler, Colin., Petre, Keziah, Latham. "Spectacle Lenses : Theory and Practice". Oxford: Butterworth-Heinemann Ltd, 2001. Text.