Emerging Source Citation Index (Web of Science)
EBSCO Education Source Complete
ERIC
ERIH PLUS
Cabell's Directory Index
Genamics JournalSeek
Index Copernicus
Mathematics Education/Didactics Database
The Mathematics Information Service (fidmath)
Mathedjournals
Mathguide
NCM
OCLC WorldCat
EdNA Online Database
ResearchGate
ROAD
Crossref
Google Scholar