Preston, L. E. (1980). Business environment/public policy: 1979 conference papers. American Assembly of Collegiate School of Business.
Lua i Stíl Chicago (17ú heag.)Preston, Lee E. Business Environment/public Policy: 1979 Conference Papers. St. Louis, Missouri: American Assembly of Collegiate School of Business, 1980.
Lua MLA (9ú heag.)Preston, Lee E. Business Environment/public Policy: 1979 Conference Papers. American Assembly of Collegiate School of Business, 1980.
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