Use this guide as you would a map; it'll help you locate the information you need.
Image Source: by Kwekubo. Street Map of Dublin. CC-BY-SA-2.0. Wikimedia Commons.
Criminology--the study of crime, criminals, criminal behavior, and corrections--may involve many fields of knowledge, including: criminal justice, sociology, psychology, economics, public policy, law, political science, and anthropology.
Because of this, when searching for criminology information, databases--which are found under the article tab--in a wide range of subject areas should be used.
Also, one should take advantage of a broad array of information: reference sources, articles, books, ebooks, and statistical resources.
Image Source: Yumi Kimura. CC BY-SA 2.0. Wikimedia Commons.