Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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