• ARIANTA - Science and branch Polish electronic journals
• Bielefeld Academic Search Engine
• The Central European Journal of Social Sciences and Humanities (CEJSH)
• Central Medical Library (Poland)
• The Directory of Open Access Journals (DOAJ)
• EBSCO
• Free Medical Journals 
• Harvard Libraries - University of California Libraries
• Index Copernicus
• J-Gate
• Main Medical Library in Warszawa
• Ministry of Education and Science
• MOST WIEDZY 
• POL-Index 
• Scopus