Bonfield, P. (1980). U.S. business leaders: A study of opinions and characteristics. Conference Board.
Lua i Stíl Chicago (17ú heag.)Bonfield, Patricia. U.S. Business Leaders: A Study of Opinions and Characteristics. [New York, N.Y.]: Conference Board, 1980.
Lua MLA (8ú heag.)Bonfield, Patricia. U.S. Business Leaders: A Study of Opinions and Characteristics. Conference Board, 1980.
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