O'BRIEN, J. J. (1971). Contractor's Management Handbook/James J. O'Brien. Mc. Graw Hill.
Chicago Style aipamenaO'BRIEN, James J. Contractor's Management Handbook/James J. O'Brien. Mc. Graw Hill, 1971.
MLA aipamenaO'BRIEN, James J. Contractor's Management Handbook/James J. O'Brien. Mc. Graw Hill, 1971.
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