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Or gather many references with a reference manager such as Zotero or EndNote. A reference manager can quickly create a bibliography for you, and you can choose from a variety of citation styles.
Citation tools and reference management tools are a big help but beware! You should review the citations for accuracy and correct formatting. Ultimately, you are responsible for the citations that you submit for an assignment, not the citation tool.
See citation examples from Purdue OWL...
APA and MLA are two commonly-used standard citation styles, but check with your professor before using either.