That's a good question - it's a while ago and the only one that really jumps out is The History of Psychology by Leahy because understanding psychology is as much about understanding how we understand the mind in the context of society, and to do that you need to know the history. Not what you were expecting ...

I highly recommend reading up on Hans Selye's biological model of stress and the HPA axis. Also worth checking out Freudelberger for the seminal article on burnout and Maslach for the formal treatment.

Organisational psychology is great but so contentious an area it's helpful to have a good teacher.

I highly recommend looking into Biopsychology, which is essentially the interplay between our mind and body and even how our mind distributed through the body.