You can find scholarly articles on almost any topic, including comparative criminal justice. Try these databases for articles that focus on CJUS/law specifically:
scholarly and popular articles on a wide variety of subjects
Ebooks provide longer, more in-depth information on different topics. You could look at ebooks on comparative criminal justice in general:
Or look for books about your specific countries' criminal justice systems. For example, if you were comparing the United States and India, you could use these two ebooks:
For more ebooks, try these databases:
collection of full-text academic e-books on a wide variety of subjects