Publishing conventions (e.g. APA, MLA, CSE...) dictate how the complete list of sources used in a publication looks to the reader. You may see the term Works Cited, References, or Bibliography. The entries may be alphabetized or ordered to match where they appear in the text. They may be collected in long lists at the end of the paper or as footnotes at the bottom of every page.
However they appear, reference lists allow you to get into the brain of the author! Using their list as a guide for your own research will save you time and give you context to issues within a subject area.