“Referencing is a system that allows you to acknowledge the sources of information you use in your writing. If you do not reference your sources you are plagiarising.” – http://www.lc.unsw.edu.au/onlib/ref.html

Also

“You must provide a reference whenever you quote, paraphrase or summarise someone else’s ideas, theories or data. You must also reference any graphic information you use. Some of the sources you will need to reference include:

books or chapters in books

journal or newspaper articles

conference papers

films or television programs

personal communications like emails, interviews or letters

electronic sources such as web pages, journal articles from online databases, or usenet groups. “

7-8

As william shakespere wrote in has famous book Romeo and Juliette, “blah blah blah. i love you.”

like that…