BOULDING, K. G. Principles of economics policy#Kenneth E. Boulding. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)BOULDING, Kenneth G. Principles of Economics Policy#Kenneth E. Boulding. Prentice Hall.
Lua MLA (8ú heag.)BOULDING, Kenneth G. Principles of Economics Policy#Kenneth E. Boulding. Prentice Hall.
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