<blockquote> - HTML 5

The <blockquote> tag specifies a section that is quoted from another source.
Browsers usually indent <blockquote> elements.
Attributes : 
cite (URL) - Specifies the source of the quotation

Syntax

<blockquote cite="URL">... Content ... </blockquote>

Example

<blockquote cite="http://www.worldwildlife.org/who/index.html">	
For 50 years, WWF has been protecting the future of nature. 
The world's leading conservation organization, 
WWF works in 100 countries and is supported by 
1.2 million members in the United States and close to 5 million globally.
</blockquote>

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Reference