Gregory, G. G. Optics Education and Outreach VII. SPIE Digital Library.
Chicago-čujuhus (17. p.)Gregory, G. Groot. Optics Education and Outreach VII. SPIE Digital Library.
MLA-čujuhus (9. p.)Gregory, G. Groot. Optics Education and Outreach VII. SPIE Digital Library.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.