ERIC is the largest education database in the world-containing over 1.5 million records of journal articles, research reports, curriculum and teaching guides, conference papers, dissertations and theses, and books.
Google Scholar provides a simple way to broadly search for scholarly literature. You can search across many disciplines and sources: articles, theses, books, abstracts etc. You may not always gain access to full-text, but it is a good search tool to explore availability of resources on Restorative Practices/Restorative Justice.
DOAJ (Directory of Open Access Journals)