Lua APA (7ú heag.)
Preston, H. K. Practical prestressed concrete. McGraw Hill.
Lua i Stíl Chicago (17ú heag.)
Preston, H. Kent. Practical Prestressed Concrete. New York: McGraw Hill.
Lua MLA (9ú heag.)
Preston, H. Kent. Practical Prestressed Concrete. McGraw Hill.
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