APA (7e ed.) Bronvermelding

Töpfer, K. (2007). The Sustainability of Cities: Design of cities, urban agglomerations and megacities for future viability. Topos.

Chicago (17e ed.) Bronvermelding

Töpfer, Klaus. "The Sustainability of Cities: Design of Cities, Urban Agglomerations and Megacities for Future Viability." Topos 2007.

MLA (8e ed.) Bronvermelding

Töpfer, Klaus. "The Sustainability of Cities: Design of Cities, Urban Agglomerations and Megacities for Future Viability." Topos, 2007.