It was published in 1994 but there's quite a good book called "Avoiding Mid Air Collisions" - just checked and it's available on Amazon.
Statistically the chances of a mid air in the open FIR are quite low (you might have a close air prox that's another matter) but I believe the main confliction point is essentially the runway and the extension of that is the circuit so correct discipline and a good lookout amongst other things go a long way to mitigate the risks.