5.1 Internet Sources.
- http://www.hbr.com
- http://www.palgrave-journals.com
- https://positioneringsgroep.nl/
- https://www.gsb.stanford.edu/faculty-research/faculty/jennifer-aaker
- https://ama-pdx.org/marketingpower-com/
- http://www.prophet.com
- https://www.eurib.net/
- http://new.zanthus.com
- http://www.cat.com
- http://brand.cat.com (secured web site)
- http://www.interbrand.com/en/best-global-brands/previous-years/best-global-brands-2007.aspx
- https://edition.cnn.com/business
- http://en.wikipedia.org
- http://www.flickr.com/photos/mleak/sets/72157601527097498/ Cover photo Emily Berezin, May 15th 2008.