Choose one style and stick with it.
See examples and instructions for some standard styles:
Check out Zoterobib for an easy way to cite in the style you choose!
When working on extensive research projects, you will need to collect, organize and format all those citations!
The following tools are appropriate to use at Penn State. They all allow you to store and search for your references, as well as link with MS Word to easily create in-text citations and bibliographies.