Watkins, W. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
Chicago Style (17th ed.) ZitazioaWatkins, Wendell. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
MLA (9th ed.) ZitazioaWatkins, Wendell. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.