Proquest databases offer a "Cite" option in the toolbar at the top of the page when viewing the full-text of a record (there is also a similar "Cite" option at the bottom of the record in the Indexing Details).
Examples of Proquest databases:
EBSCOhost databases offer a "Cite" option when viewing full records, which is located in the "Tools" box on the right side of the database screen.
Examples of EBSCOhost databases:
Gale databases provide two sources of citation help:
Examples of Gale databases: