The Australian Institute of Criminology is Australia's national research and knowledge centre on crime and justice.
You should be able to find a number of publications on juvenile offending and doli incapax on this site.
The Australasian Legal Information Institute (AustLII) provides free internet access to Australasian legal materials. AustLII's broad public policy agenda is to improve access to justice through better access to information.
The society is devoted to promoting criminological study, research and practice in the region and bringing together persons engaged in all aspects of the field.