References must be reliable sources - such as newspapers, books, or "trustworthy" websites like BBC, CNN News.

For 'how', see below.  ►  

How references work

 Simple references 

These require two parts;

a)
Chzz is 98 years old. "The book of Chzz", Aardvark Books, 2009. 

He likes tea.  [http://www.nicecupofteaandasitdown.com Tea website] 

b) A section called "References" with the special code "{{reflist}}";
== References ==
{{reflist}}

(an existing article is likely to already have one of these sections)

To see the result of that, please look at user:chzz/demo/simpleref. Edit it, and check the code; perhaps make a test page of your own, such as user:/reftest and try it out.

 Named references 

Chzz was born in 1837. 
"The book of Chzz", Aardvark Books, 2009. 
 

Chzz lives in Footown.

Note that the second usage has a / (and no closing ref tag). This needs a reference section as above; please see user:chzz/demo/namedref to see the result.

 Citation templates 

You can put anything you like between  and , but using citation templates makes for a neat, consistent look;

Chzz has 37 Olympic medals.  {{Citation
 | last = Smith
 | first = John
 | title = Olympic medal winners of the 20th century
 | publication-date = 2001
 | publisher = [[Cambridge University Press]]
 | page = 125
 | isbn = 0-521-37169-4
}}


Please see user:chzz/demo/citeref to see the result.

For more help and tips on that subject, see user:chzz/help/refs.