Beckmann, L. Contemporary Optical Instrument Design, Fabrication, and Testing. SPIE Digital Library.
Chicago-čujuhus (17. p.)Beckmann, Leo. Contemporary Optical Instrument Design, Fabrication, and Testing. SPIE Digital Library.
MLA-čujuhus (9. p.)Beckmann, Leo. Contemporary Optical Instrument Design, Fabrication, and Testing. SPIE Digital Library.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.