Each of the links on this guide will take you to the Chicago Manual of Style, which will give you several examples for how to cite that item.
First, answer the following questions. What kind of article do you have? Is it a scholarly journal article? A magazine article? A newspaper article? Did you find it in a print publication? In a library database? On the internet elsewhere?
All article citations start with the name of the author, followed by the title of the article, and the title of the publication the article is in. From there, different types of articles are cited differently. Scholarly journal articles include the volume and issue, while magazines and newspapers do not.
The last piece of a scholarly journal or magazine article citation is the page number(s) for the article, if known. If you are only using one page from the article, use that page number, but if you are referring to the entire article, then use all of the page numbers.