HUTCHINGS, J. F. (1998). National buliding codes handbook. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)HUTCHINGS, Jonathan F. National Buliding Codes Handbook. New York: McGraw-Hill, 1998.
Lua MLA (9ú heag.)HUTCHINGS, Jonathan F. National Buliding Codes Handbook. McGraw-Hill, 1998.
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