The basic principle for citing your sources is that you must give credit to the people who originated the evidence you use to support your thesis.
Although the principle of citing is the same, the details about how you format those citations may vary. Each discipline has its preferred "style" of citing resources. For instance, papers written for a physics class will probably use a different style of citation than papers written for a sociology class.
Personalized help is available at the OSU Writing Center.
Depending on your area of study and your instructor's requirements, you may use one of a variety of style manuals.
When writing papers for a class, check to see what citation style your instructor requires. To find this information: