Perrott, C. Ophthalmic Lens Design and Fabrication. SPIE Digital Library.
Tohutoru Kātū Chicago (17th ed.)Perrott, Colin. Ophthalmic Lens Design and Fabrication. SPIE Digital Library.
Tohutoro MLA (9th ed.)Perrott, Colin. Ophthalmic Lens Design and Fabrication. SPIE Digital Library.
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