You have two options for locating permalinks for the library's ebooks.
Option 1. Use the Permanent Link to the ebook's record in OneSearch:
Option 2. Direct URL for the ebook
You may prefer using the direct URL to the ebook. You can copy the direct URL to the ebook by right-clicking on the link after "Full text available at:" and selecting "Copy link address."
The library proxy is already included in the URL.