The Internet is a popular source of information for student papers. To avoid plagiarising these sources follow the same guidelines as print sources.
For example in the APA style the Author of the website should be cited in-text, and a full reference given at the end for the website including the URL.
In-text citation, APA Style:
Another approach (Gambill, 2011) suggests...
Reference List entry, APA Style:
Gambil l, G (April 6th 2011). Assad's survival strategy. Foreign Policy. Retrieved April 18th, 2011, from http://www.foreignpolicy.com/articles/2011/04/06/assads_survival_strategy