A reputable international journal is a journal indexed in databases:
1. DOAJ (Directory of Open Access Journals)
Can be seen at: https://doaj.org/
2. SCOPUS
Can be seen at: http://www.scimagojr.com/
3. THOMSON REUTERS
Can be seen at: http://ip-science.thomsonreuters.com/mjl/
4. ELSEVIER
Can be seen at: https://www.elsevier.com/
5. SPRINGER
Can be seen at: http://www.springer.com/gp/
6. Wiley Online Library
Can be seen at: http://onlinelibrary.wiley.com/
7. Taylor & Francis
Can be seen at: https://taylorandfrancis.com/
