Typically include the author's name, the year published, and the page number (if applicable).
Example: (Hildenbrand 1999:47)
If the author is mentioned by name in the preceding sentences (e.g. "According to Hildenbrand...") leave out the author's name.
Example: (1999:47)
For a Book
Author Last, First and Author First Last. Year of Pub.Title. City, State Abb./Country of Publisher: Publisher.
For a Journal Article
Author Last, First. Year of Pub. "Title." Journal Name volume # (issue #): inclusive page numbers if available.
For a Website
Corporate Author Name or Last Name, First of Author. Date of Pub. "Title." Retrieved Month Day, Year (URL).