Varis, L. (2011). Mastering exposure and the zone system for digital photographers. Course Technology PTR.
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Chicago-čujuhus (17. p.)
Varis, Lee. Mastering Exposure and the Zone System for Digital Photographers. Boston, Mass., U.S.A.: Course Technology PTR, 2011.
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MLA-čujuhus (9. p.)
Varis, Lee. Mastering Exposure and the Zone System for Digital Photographers. Course Technology PTR, 2011.
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