There are several ways or 'styles' to cite information. Generally speaking, Social and English use MLA and Science uses APA. If you are uncertain which style to use, ask your teacher.
Use Noodletools to help make a proper bibliography. You can sign on as a registered user for advanced features (see library staff for help).
Here is the quick version of Noodletools that doesn't require logon: NoodleTools Express
EasyBib is another great source to help you with your research and bibliography formatting.