Lippitt, V. G. (1975). The national economic environment \. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Lippitt, Vernon G. The National Economic Environment \. New York: McGraw-Hill, 1975.
Lua MLA (8ú heag.)Lippitt, Vernon G. The National Economic Environment \. McGraw-Hill, 1975.
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