American Goverment:
http://americangovernment.abc-clio.com/Search/Display/202977

Wikipedia:
http://en.wikipedia.org/wiki/Elastic_clause

John Marshall:
http://en.wikipedia.org/wiki/John_Marshall

John Marshall:
http://americangovernment.abc-clio.com/Search/Display/196634

National Bank:
http://americangovernment.abc-clio.com/Search/Display/210428

Google:
http://www.google.com/

Google Images:
http://www.google.com/imghp?hl=en&tab=wi