The source information is the clue to figuring out what kind of resource the citation points to:
For a book, the source information will be a place of publication and a publisher.
For an article, the source information will be the journal title, the volume and issue numbers and the page numbers.
For a website, the source information will be the URL (which normally begins http://).
Other types of publications (audio/visual materials, government documents, dissertations, etc.) will generally include the basic four elements, but will also include enough information in order for the person reading the citation to identify both the type of information source, as well as how to find the information again.
content created by Faith Lane
Contact the Writing Center for additional help with formatting.