Gumbel, J. E. (1983). Analysis and design of buried flexible pipes.
Lua i Stíl Chicago (17ú heag.)Gumbel, John Ernest. Analysis and Design of Buried Flexible Pipes. 1983.
Lua MLA (8ú heag.)Gumbel, John Ernest. Analysis and Design of Buried Flexible Pipes. 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.