My reply here might not be quite what you were asking for, but I wanted to say
that I find Martin Seligman's ideas useful (about optimism, positive psychology).
He might be one who writes about happiness. You can google Seligman.
http://www.authentichappiness.sas.up.../seligman.aspx
It's useful to understand the defense mechanisms (denial, projection, rationalization,
etc.).
All the best in your studies.