BrowZine

R Discovery

discovery.researcher.life

Open Library

openlibrary.org

Scopus

scopus.com

Web of Science

webofscience.com

ZINIO

zinio.com

Scholars

scholars.io

Wiley Online Library

onlinelibrary.wiley.com

Research Solutions

researchsolutions.com

ZoteroBib

zbib.org

ProQuest

proquest.com

Zendy

zendy.io

Crossref

crossref.org

PaperBrain

paperbrain.study

OA.mg

oa.mg

BibSonomy

bibsonomy.org

DeepDyve

deepdyve.com

BMC

biomedcentral.com

ROAD

road.issn.org

Blainy

blainy.com

Hindawi

hindawi.com

LibKey

libkey.io

Blipps.io

blipps.io

BibBase

bibbase.org

Dove Medical Press

dovepress.com