You need to us APA for your citations. Even though you are retrieving the article from a website, you still need to include the author, date, article title, journal, volume/issue, and page numbers of the article. When applicable you should also include the DOI and/or website.
This tutorial (http://researchguides.baylor.edu/readacitation) will help you understand the purpose of citations and the information that is needed in a citation.
You may wish to consider using bibliographic or citation manager to organize your articles. These programs not only offer away to organize the articles you find by allowing you to put them in folder and label them with key words and take notes on the articles, but they also allow you to export your references directly to your word processor in the correct format you need.
For more information check out these research guides: