Youmans, W. J. Appleton's popular science monthly. D. Appleton and Co.
Lua i Stíl Chicago (17ú heag.)Youmans, William Jay. Appleton's Popular Science Monthly. New York: D. Appleton and Co.
Lua MLA (8ú heag.)Youmans, William Jay. Appleton's Popular Science Monthly. D. Appleton and Co.
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