GERWICK, B. C. (1992). Construction Of Presstressed Concrete Structures. John Willey & Sons.
Lua i Stíl Chicago (17ú heag.)GERWICK, Ben C. Construction Of Presstressed Concrete Structures. John Willey & Sons, 1992.
Lua MLA (8ú heag.)GERWICK, Ben C. Construction Of Presstressed Concrete Structures. John Willey & Sons, 1992.
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