Gaya APA

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

Gaya MLA

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