Töpfer, K. (2007). The Sustainability of Cities: Design of cities, urban agglomerations and megacities for future viability. Topos.
Lua i Stíl Chicago (17ú heag.)Töpfer, Klaus. "The Sustainability of Cities: Design of Cities, Urban Agglomerations and Megacities for Future Viability." Topos 2007.
Lua MLA (8ú heag.)Töpfer, Klaus. "The Sustainability of Cities: Design of Cities, Urban Agglomerations and Megacities for Future Viability." Topos, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.