Citation is an important element in research and creating new knowledge: crediting the scholarship that you're building on, and creating a path for your readers to follow your process. The basic principle is to include all information necessary to track down a resource, but different citation styles format that in different ways.
Generally, the American Political Science Association follows the Chicago Manual of Style. If you are not sure which citation style to use, ask your instructor.
The Style Manual for Political Science provides guidance for formatting manuscripts and reference lists using the same format required for APSA journals.
Chicago-Style Citation Quick Guide online, from the full Chicago Manual of Style; also consult the print Chicago Manual of Style at Call Number: AC Frost Reference Z253 .U69 2017