To manually add a reference to a chapter or article in a book, click the New Item button and choose "Book Section."
For a single chapter from a book by the same author(s) throughout:
Fill in the fields relevant to the chapter, observing the capitalization standards of your citation style. Note that the “Title” field refers to the chapter title.
For a section in a book collecting several articles, with book-level editors:
Fill in the fields relevant to the chapter, observing the capitalization standards of your citation style. Note that the “Title” field refers to the article or chapter title, and the "Author" field refers to the article or chapter author(s).
To insert the name of the book's editor(s), click the plus sign next to the “Author” field. In the new author field that appears, click the carat next to “Author” and change it to “Editor,” and enter the editor’s name. Repeat this process if the book has multiple editors, or if the article or chapter has multiple authors.