Greenler, R. Rainbows, Halos, and Glories. SPIE Digital Library.
Chicago Style (17th ed.) ZitazioaGreenler, Robert. Rainbows, Halos, and Glories. SPIE Digital Library.
MLA (9th ed.) ZitazioaGreenler, Robert. Rainbows, Halos, and Glories. SPIE Digital Library.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.