Não informado. (1920). International Index to Periodicals. H. W. Wilson.
Lua i Stíl Chicago (17ú heag.)Não informado. International Index to Periodicals. New York: H. W. Wilson, 1920.
Lua MLA (8ú heag.)Não informado. International Index to Periodicals. H. W. Wilson, 1920.
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