HUBBARD RON L. (2001). TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD.
Chicago Style aipamenaHUBBARD RON L. TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD, 2001.
MLA aipamenaHUBBARD RON L. TOOL FOR THE WORK PLACE. NEW ERA PUB. CO. LTD, 2001.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.