Wittfoht, H. (1967). Considerations on the cross-sectional design of prestressed concrete bridges with reference to bridges built in 1960. Cement and Concrete Association.
Lua i Stíl Chicago (17ú heag.)Wittfoht, H. Considerations on the Cross-sectional Design of Prestressed Concrete Bridges with Reference to Bridges Built in 1960. London: Cement and Concrete Association, 1967.
Lua MLA (8ú heag.)Wittfoht, H. Considerations on the Cross-sectional Design of Prestressed Concrete Bridges with Reference to Bridges Built in 1960. Cement and Concrete Association, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.