I need to do APA Using only peer review articles not internet source, my research is going to be base on studing if the Justice System

I need to do APA Using only peer review articles not internet source, my research is going to be base on studing if the Justice System, just or is taking in consideration juvenile crimes base on the development of they frontal lobe that is the one in charge on the making decision process, and how its developing jusr or is or will affect the judgment of those juveniles commiting crimes