Watkins, W. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWatkins, Wendell. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWatkins, Wendell. Targets and Backgrounds XII: Characterization and Representation. SPIE Digital Library.
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