The article hasn't much validity if it was published in the National Inquirer , but if it was in the New York Times you've got something. With a citation anyone can go right to the original source and quickly verify a fact or find out more. The actual form for citations differs depending on whether the source is a book, journal, magazine, newspaper article, or film. Consult a style guide to determine which form to use. The Chicago Manual of Style is used by book publishers.
Many English teachers suggest shorter guides.
I won't quibble about form if the information is all there. For journals include author's name, title of publication, publication date, and page number. Book citations include the author, title, publisher, city of publication, and copyright date, plus the page number. For films you should include the name of the director and the production date. You may look at the style used in your textbook and copy that.