Idelberger, K., & Wilharm, L. (2011). The world of footbridges: From the utilitarian to the spectacular. Ernst & Sohn.
Citazione stile Chigago Style (17a edizione)Idelberger, Klaus, e Linda Wilharm. The World of Footbridges: From the Utilitarian to the Spectacular. Berlin: Ernst & Sohn, 2011.
Citatione MLA (9a ed.)Idelberger, Klaus, e Linda Wilharm. The World of Footbridges: From the Utilitarian to the Spectacular. Ernst & Sohn, 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.