O'BRIEN, J. J. (1993). Cpm In Construction Management James J. O Brien. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)O'BRIEN, James J. Cpm In Construction Management James J. O Brien. McGraw-Hill, 1993.
Lua MLA (8ú heag.)O'BRIEN, James J. Cpm In Construction Management James J. O Brien. McGraw-Hill, 1993.
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