Radtke, M. (1981). Denkmale in der Urlandschaft: Land Art made in Germany. Art.
Čikaški stil citiranja (17. izdanje)Radtke, Michael. "Denkmale in Der Urlandschaft: Land Art Made in Germany." Art 1981.
MLA način citiranja (8. izdanje)Radtke, Michael. "Denkmale in Der Urlandschaft: Land Art Made in Germany." Art, 1981.
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