Arnold, J. I. 1. (1934). Problems in American life. Row.
Lua i Stíl Chicago (17ú heag.)Arnold, Joseph Irvin 1887. Problems in American Life. Evanston, Ill., New York [etc.]: Row, 1934.
Lua MLA (9ú heag.)Arnold, Joseph Irvin 1887. Problems in American Life. Row, 1934.
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