For the CQ Researcher database, the document URL is included below the source citation located at the end of an article.
Be sure to copy the entire URL:
Example of a document URL:
http://library.cqpress.com/cqresearcher/cqr_ht_education_2016
Here is the same URL but edited and ready to use and share:
http://0-library.cqpress.com.archway.searchmobius.org/cqresearcher/cqr_ht_education_2016