Dyfyniad APA

(2001). ENR [Engineering News Record]The TOP 400 Contractors Sourcebook 2001. McGraw-Hill.

Dyfyniad Arddull Chicago

ENR [Engineering News Record]The TOP 400 Contractors Sourcebook 2001. McGraw-Hill, 2001.

Dyfyniad MLA

ENR [Engineering News Record]The TOP 400 Contractors Sourcebook 2001. McGraw-Hill, 2001.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.