Campbell, H. (1880). Unto the third and fourth generation: A study. Fords, Howard & Hulbert.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCampbell, Helen. Unto the Third and Fourth Generation: A Study. New York: Fords, Howard & Hulbert, 1880.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCampbell, Helen. Unto the Third and Fourth Generation: A Study. Fords, Howard & Hulbert, 1880.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.