It is your responsibility to provide the reader with the precise sources of quotations, ideas and points of view in your essay. You achieve this through accurate citations, which may include in-text or footnotes throughout your essay, and a full list of references at the end of your paper. The type of citation method you use will vary depending on your subject matter and/or the instructions of your school.
As a general rule of thumb, the four main citation styles used in academic publications are:
There are plenty of websites that you can find online to clarify how to cite your sources.