DOAJ

Index Medicus for the Eastern Mediterranean Region (IMEMR)

Research4Life

ASCI Database

ROAD

ICMJE

Index Copernicus 

ResearchBib

ADVANCED SCIENCES INDEX

MIAR

American University Library (Washington, DC)

Princeton University Library

Universiteitsbibliotheek Gent

EZB, Electronic Journals Library

German Union Catalogue of Serials (ZDB)

HAMK-Finna

NOAA Central Library

RMIT University/ Australia

Collège de France

Austrian Academy of Sciences

Libraries-University of New Brunswick

Library-University of Saskatchewan

CIVILICA

Cosmos

Worldcat

Base

Journalsearches

JournalList

Geneva Foundation for Medical Education and Research

Google Scholar