While MS Word 2007, certain databases and other on-line resources such as EasyBib offer automatic MLA/APA formatting tools for citations, these systems are not always accurate or complete and do not allow for formatting of all pertinent information.
If you use these online tools it is important to double check the accuracy of your results against a style sheet such as those linked to in this guide.
Be aware that some instructors may have additional or specialized requirements for your citations. For example, while MLA 2009 format does not require you to include the full URL in your citation, some instructors prefer that you do.
Always be cognizant of class requirements and seek confirmation from classmates or your instructor.