When you add a new citation to a document, you also create a new source that will appear in the bibliography.
To insert an existing source, select that source from the source list.
Note: Word creates a Master List of all sources used on that computer. This list is stored in a separate file on the hard drive, and is available in the Manage Sources menu. If you use a campus lab computer, or another shared computer, you may not see a Master List.
You can create a bibliography at any point after you insert one or more sources in a document. If you don't have all of the information that you need about a source to create a complete citation, you can use a placeholder citation, and then complete the source information later.
Note: Placeholder citations do not appear in the bibliography. You must add full information before they will be added.