JOHNSON , R. (1967). Structural Concrete R.p. Johnson. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)JOHNSON , R.P. Structural Concrete R.p. Johnson. McGraw-Hill, 1967.
Lua MLA (8ú heag.)JOHNSON , R.P. Structural Concrete R.p. Johnson. McGraw-Hill, 1967.
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