Although every database is a little different in appearence, they all have a permalink/persistent link function. Below you will find screenshots from the more popular databases and where to locate the permalink/persistent links.

Don't forget that a DOI is a permalink/persistent link.

URL Forumlas

Purple is the proxy code, the blue is the database code, the red is the article ID.

Linking to articles with DOI (digital object identifier)

http://flagship.luc.edu/login?url=http://dx.doi.org/yourDOInumber

Other Examples:

OVID Databases
http://flagship.luc.edu/login?url=http://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=ovft&AN=[accession number]

Taylor and Francis Journal static URL's
http://flagship.luc.edu/login?url=http://www.tandfonline.com/doi/abs/[doi] 

ScienceDirect (DOI)

Wiley (DOI)

Library Catalog

WorldCat Local

EBSCO

ProQuest

Ovid

JSTOR

Project Muse (URL)