Quotations are a very good way to back up what you are saying. They provide an independent justification or collaboration of your point of view.
Starting your presentation with a quotation is a typical trick.
With the Internet, getting quotes is now so easy, there are many sites like www.quotationspage.com, www.thinkexist.com www.saidwhat.co.uk all of which provide a wide range of different quotes, from different people. Most are searchable by author and subject.
Quotations can however be over used in which case they tend to be viewed in the same way as Benjamin Disraeli viewed statistics: ‘There are lies, damn lies and statistics’
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Posted by Graham Young 
Graham Young
A to Z of Business Presentations 