When You Need to Seek Permission, and Sample Permission Letter
Case Western Reserve University, "When Permissions Are Needed", Copyright Compliance Policy 13 (last visited 4/30/2019).
Other helpful sites:
Copyright Clearance Center, Get Permissions (last viewed 6/2019).
University of Texas Libraries, "Getting Permission" in Copyright Crash Course (last updated 4/5/2018) (created by Georgia Harper).