Definition: A permalink is a web address that will consistently point to a specific information source such as an ebook, an article, a record in the catalog, a video, or a database.
A permalink may also be called a stable link, durable link, persistent link, permanent link or document url, depending on the resource.
How do I find permalinks?
Most research databases include a permalink in the article record. The terms used and the location of these links in the record vary from one database to another.
Where are the Permalinks in Worldwide Political Science Abstracts?
Permalinks for ProQuest articles are called Document URLs.
The document URL is found in the Indexing Details section located at the end of an article.
You will see a 
button when a pdf or html link does not accompany an article. lets you know if the full-text is available: