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In Chicago style, "chapter" is lowercased, even if it is used as a title. (An example from the Chicago Manual of Style Q&A page: http://www.chicagomanualofstyle.org/CMS_FAQ/Capitalization/Capit...
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Source: https://writers.stackexchange.com/a/6388 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
In Chicago style, "chapter" is lowercased, even if it is used as a title. (An example from the Chicago Manual of Style Q&A page: [http://www.chicagomanualofstyle.org/CMS\_FAQ/Capitalization/Capitalization10.html](http://www.chicagomanualofstyle.org/CMS_FAQ/Capitalization/Capitalization10.html)) [APA style](http://www.uwf.edu/edd/internal/documents/apa_faq.htm#chapteref) also suggests lowercasing "chapter." The [Mayfield Handbook of Technical & Scientific Writing](http://www.mhhe.com/mayfieldpub/tsw/capitals.htm), on the other hand, recommends capitalizing "references to specific figures, tables, chapters, sections, equations." So, in short, it varies between different style guides. If the book you're working on isn't following a particular style guide, then it's up to your or the author's preference, as long as you're consistent. (I'd recommend making a note of decisions like this on a style sheet for the book--which could be as simple as a list in a Word document. That can help keep things consistent.)