APA organizes its headings by levels (e.g. level 1 headings, level 2 headings, etc.). You can find an example from of how to organize your headings from the APA style guide on our APA citation guide.
MLA Style Headings
The MLA Style website has some suggestions for headings and subheadings (the same rules apply for both the 8th and 9th edition).
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