Citation and referencing is a very important part of academic research. Not only does it give credit to the authors who did the work of creating information, it also evidences the work you have done in constructing your research, and builds the conversation network between researchers - inviting more and more voices into the interaction.
Here are some guides to consult as you extend the conversation!
These are sites that will help you "build" citations. They're pretty accurate, but be sure to cover your bases by comparing the citations against those in a style manual. Just choose MLA or APA and the type of source you need to create a citation for (a book, a journal article, etc.), and input all of the necessary information.