Porter, T. M. Reforming vision: The engineer Le Play learns to observe society sagely / Theodor M. Porter. Histories of scientific observation.(2011).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPorter, Theodor M. "Reforming Vision: The Engineer Le Play Learns to Observe Society Sagely / Theodor M. Porter." Histories of Scientific Observation.(2011) .
एमएलए (8वां संस्करण) प्रशस्ति पत्रPorter, Theodor M. "Reforming Vision: The Engineer Le Play Learns to Observe Society Sagely / Theodor M. Porter." Histories of Scientific Observation.(2011), .
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.