Penn State offers various guides and tutorials to help you cite your work correctly: 

Many Penn State locations have "Academic Achievement Centers," "Learning Centers," or other offices where you can obtain coaching and feedback on your writing. Here are the largest ones:

• Penn State Learning (serves University Park and World Campus)
• Penn State Abington Center for Student Achievement
• Penn State Altoona Learning Resource Center
• Penn State Behrend Learning Resource Center
• Penn State Berks Learning Center
• Penn State Harrisburg Russell E. Horn Learning Center

If you do not see your location above, find your campus's website, click on the "Academics" link at the top of the page, and look for links to "Academic Resources" or "Academic Support." 

Also, these books, tutorials, and videos can help: