A style guide (or manual of style) is a set of standards for the writing and design of documents, either for general use or for a specific publication, organization, or field. (It is often called a style sheet, though that term has other meanings.)
- Website Style Guide Resources (website). Brad Frost.
- A huge list of Style Guides and UI Guidelines. The UX Bookmark.
- The Elements of a Style Guide. UX Magazine.
- Front-End Style-Guides: Definition, Requirements, Component Checklist. Nielsen Norman Group.