Author, A. A. (Year of publication). Title of work: Capital letter also for subtitle. Location: Publisher.
Author, A. A., & Author, B. B. (Date of publication). Title of article. Title of Online Periodical, volume number(issue number if available). Retrieved from http://www.someaddress.com/full/url/
Other citation formats, including those for other resources, can be found at the Purdue OWL website