Não informado. (1957). Business Horizons. Indiana University, School of Business.
Lua i Stíl Chicago (17ú heag.)Não informado. Business Horizons. Bloomington, Ind: Indiana University, School of Business, 1957.
Lua MLA (8ú heag.)Não informado. Business Horizons. Indiana University, School of Business, 1957.
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