i thoroughly follow sohail bhatt's criminology bok, but when i see research paper stuff or wikipedia material i switched to other internet sources.
But i must say investigation, interrogation techniques are worth reading topics from sohail bhatti's book.
Wikipedia is good source for getting basic knowledge about any law,theory etc but don't make notes from that material.
If you don't have that book just drop me an email I'll take pics of these topics and send you.
http://www.pakistansocietyofcriminology.com/ is good source to verify laws, read articles only and only when you find the material relevant to the topic you intended to study.