The American Psychological Association (APA) journals
permit authors to self-archive their journal articles on their personal web sites or in "institutional repositories."
The article "
Does Learning About the Mathematics of Gambling Change Gambling Behavior?" by Robert Williams and Dennis Connolly appears in the March 2006 issue of the APA journal Psychology of Addictive Behaviors and has been self-archived in the Alberta Gaming Research Institute's DSpace community which is hosted by the University of Calgary.
You'll note that this particular copy of the article is not the "official copy of record" and does not contain the same page formatting as the official APA version. It does, however, contain the final version of the content that was submitted and accepted for publication in the journal.