(2017). Ruhrgebiet Industrial Cultural Landscape: Draft statement of outstanding universal value. Proposal for an update of the German tentative list for UNESCO world heritage (1a. ed.). SIG.
Citace podle Chicago (17th ed.)Ruhrgebiet Industrial Cultural Landscape: Draft Statement of Outstanding Universal Value. Proposal for an Update of the German Tentative List for UNESCO World Heritage. 1a. ed. s.l: SIG, 2017.
Citace podle MLA (9th ed.)Ruhrgebiet Industrial Cultural Landscape: Draft Statement of Outstanding Universal Value. Proposal for an Update of the German Tentative List for UNESCO World Heritage. 1a. ed. SIG, 2017.
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