Encyclopedia.com: Clark, Joe - Encyclopedia entry on the 16th Prime Minister of Canada, includes links to additional information. - http://www.encyclopedia.com/doc/1E1-ClrkJoe.html
Charles Joseph Clark - Brief sketch of Canada's 16th Prime Minister. - http://www.collectionscanada.ca/primeministers/h4-3400-e.html
The Right Honourable Joe Clark - Biographical information on Canada's 16th Prime Minister. - http://www.craigmarlatt.com/canada/government/clark.html