HUBBARD RON L. (2001). TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD.
Cita Chicago (17th ed.)HUBBARD RON L. TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD, 2001.
Cita MLA (9th ed.)HUBBARD RON L. TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.