Hall, H. J. (1915). The untroubled mind. Houghton Mifflin Company.
Lua i Stíl Chicago (17ú heag.)Hall, Herbert James. The Untroubled Mind. Boston, New York: Houghton Mifflin Company, 1915.
Lua MLA (8ú heag.)Hall, Herbert James. The Untroubled Mind. Houghton Mifflin Company, 1915.
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