Find the chapter's DOI number
Find "Citation Linker" on the library website
Click the Book radio button, paste the chapter's DOI number into the DOI field, and click Find it.
Note: include the number only, not the "doi.org/" part.
The resulting screen should show the full citation details and a request button. Click request.
Login to your Interlibrary Loan account w/WUSTL Key
Check that the form is filled correctly, and click "submit request"