[hiq]

How can you tell it is not published? It seemed to me that it had been published in the American psychologist according to [1].

[1] https://www.ncbi.nlm.nih.gov/pubmed/16366817

[philh]

My bad. It looks like the link was to a pre-publication draft, but it has indeed since been published.

[xyzzyz]

Just FYI: many papers available onlines are actually preprints/drafts, because the researchers are much freer to distribute them, than the actual published papers bearing journal branding.