Roybal, W. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
Chicago-čujuhus (17. p.)Roybal, William. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
MLA-čujuhus (9. p.)Roybal, William. Advanced Telescope Design, Fabrication, and Control. SPIE Digital Library.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.