See: VisualEditor vs. Citation_bot and Citation bot bug report.
Summary: Edit war between two automated mechanisms.
- VisualEditor, given an isbn, a cite book is generated which contains isbn, oclc, and url for WorldCat.
- Citation bot removes the url.
Requested information that is probably not relevant in this case :)
web browser: Google Chrome 80.0.3987.149 (Official Build) (64-bit) (cohort: Stable)
computer operating system: Microsoft Windows [Version 10.0.18363.720]
Wikipedia skin: Vector