JStor

http://www.jstor.org/

Lexicon Greek Grammarians of Antiquity

http://referenceworks.brillonline.com/browse/lexicon-of-greek-grammarians-of-an…

Library of Latin Texts Online - LLT-O

http://apps.brepolis.net/LTool/Entrance.aspx?w=12

Library, Information Science & Technology Abstracts

https://research.ebsco.com/c/zgycs2/search/?db=lxh

Linguistic Bibliography Online

https://bibliographies.brillonline.com/browse/linguistic-bibliography

Material Evidence in Incunabula - MEI

http://incunabula.cerl.org/cgi-bin/search.pl

Medioevo latino - MEL

https://sip-mirabileweb-it.ezproxy.uniroma1.it

Mirabile

https://sip-mirabileweb-it.ezproxy.uniroma1.it

MLA International Bibliography

https://research.ebsco.com/c/zgycs2/search/?db=mzh

Monumenta Germaniae Historica - MGH

http://clt.brepolis.net.ezproxy.uniroma1.it/emgh