Citations and references are closely related but refer to two different pieces of information that should appear in your work.
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A citation is a mention of a source within your text. Citations are usually included within parentheses brackets with note information like author, date of publication, or page number where the information can be found. The information within citations differs depending on which citation style you are using.
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A reference is a description of each source that you use within your text. References are listed at the end of your document in alphabetical order and include information like author, source title, publisher, date of publication, etc. The information within references differs depending on which citation style you are using.
Source of Answer: Turnitin article https://help.turnitin.com/integrity/student/draft-coach/understanding-draft-coach.htm#what-is-the-difference-between-a-citation-and-a-reference