Zeveloff, Naomi: Israel Was 'Key' Issue in Caterpillar Dump. In: The Jewish Daily Forward. 25. Juni 2012, abgerufen am 29. Juni 2012 (englisch): „The key factors determining the rating include a January 2012 labor dispute and subsequent plant closing in Canada, an on-going controversy associated with use of the company’s equipment in the occupied Palestinian territories, management of environmental issues, and employee safety.“
Form 8-K. Current Report, Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. In: sec.gov. United States Securities and Exchange Commission, 1. Juli 2003, abgerufen am 11. Oktober 2015 (englisch).
