Hopfenbeck, W. (1993). The green management revolution: Lessons in environmental excellence. Prentice-Hall.
Čikaški stil citiranja (17. izdanje)Hopfenbeck, Waldemar. The Green Management Revolution: Lessons in Environmental Excellence. New York: Prentice-Hall, 1993.
MLA način citiranja (9. izdanje)Hopfenbeck, Waldemar. The Green Management Revolution: Lessons in Environmental Excellence. Prentice-Hall, 1993.
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