Smiles, S. (1881). Duty, with illustrations of courage, patience, and endurance. Bedford, Clarke & co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSmiles, Samuel. Duty, with Illustrations of Courage, Patience, and Endurance. Chicago: Bedford, Clarke & co., 1881.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSmiles, Samuel. Duty, with Illustrations of Courage, Patience, and Endurance. Bedford, Clarke & co., 1881.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.