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• W3C's "Headings and Semantics" Guide: This guide from the W3C provides a deeper look into the importance of using proper heading structures (H1, H2, etc.) for both accessibility and search engine optimisation. 

• Microsoft Word's Accessibility Support: Microsoft provides excellent tutorials on how to use Styles and the Navigation Pane in Word to create well-structured and accessible documents. 

• WebAIM's "Semantic Structure" Tutorial: A comprehensive tutorial that explains why semantic structure, particularly with headings, is crucial for screen reader users to navigate a document.