World Intellectual Property Organization (Geneva, Switzerland). (2016). International survey on text and image copyright levies: 2015 edition. WIPO.
Citace podle Chicago (17th ed.)World Intellectual Property Organization (Geneva, Switzerland). International Survey on Text and Image Copyright Levies: 2015 Edition. Geneva: WIPO, 2016.
Citace podle MLA (9th ed.)World Intellectual Property Organization (Geneva, Switzerland). International Survey on Text and Image Copyright Levies: 2015 Edition. WIPO, 2016.
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