Smiles, S. (1881). Duty, with illustrations of courage, patience, and endurance. Bedford, Clarke & co..
Lua i Stíl Chicago (17ú heag.)Smiles, Samuel. Duty, with Illustrations of Courage, Patience, and Endurance. Chicago: Bedford, Clarke & co., 1881.
Lua MLA (8ú heag.)Smiles, Samuel. Duty, with Illustrations of Courage, Patience, and Endurance. Bedford, Clarke & co., 1881.
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