Ggression and its influence on sporting performance

This needs to be a critical review looking at the differing studies into how aggression can effect sporting performance, both to the positive and to the negative.
Must include 5journals from sport science journals found in the UK.

This to needs to be water tight as the last piece of work i got from here was slated topieced for using as a reference so would like a piece that will hold its ground!!!!!
Harvard Style