Engman, E. Remote Sensing for Agriculture, Forestry, and Natural Resources. SPIE Digital Library.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEngman, Edwin. Remote Sensing for Agriculture, Forestry, and Natural Resources. SPIE Digital Library.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEngman, Edwin. Remote Sensing for Agriculture, Forestry, and Natural Resources. SPIE Digital Library.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.