Where can I find these journals with full-text articles FREE on line:
Journal of Personality and Social Psychology: 1997;
73(2):321-336;1983;(same Journal)45(2):335-343.

Journal of Social Behavior and Personality 1992; 7(1):25-42
American Journal of Psychotherapy 1990:44(1):75-84
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Most online full-text journals only have 2-3 years worth of articles
available, not articles that are 5-20 years old.

Also, most journals only offer full-text articles to subscrubers, such
as college libraries.

The quick answer is you can't.  

Journal of Personality & Social Psychology is not available for free. 
The particular article you want for the first citation is not
available on the web free of charge in any format.  The second is
probably too old to be digitized.  Not everything is on the web.

Same seems to be true for the other two journals.  You might be able
to find some of these full text for a fee or if you have an
affiliation with a college or university, you could probably access
the first from there.  My university has access to it, but the
licensing would prohibit me from getting it to you.

Regards,
luciaphile-ga