https://www.crossref.org/

Crossref makes research outputs easy to find, cite, link, assess, and reuse.

https://myjurnal.mohe.gov.my/public/browse.php

MyJurnal is a online system used by Citation and Infometric Division (formely known Malaysia Citation Centre (MCC)) to collect and index all the Malaysian journals.

https://mycite.mohe.gov.my/

MyCite or Malaysian Citation Index will provide access to bibliographic as well full-text contents of scholarly journals published in Malaysia in the fields of Sciences, Technology, Medicine, Social Sciences and the Humanities.

https://doaj.org/

DOAJ is a unique and extensive index of diverse open access journals from around the world, driven by a growing community, committed to ensuring quality content is freely available online for everyone.

ISSN.ORG

https://portal.issn.org/resource/ISSN/2682-8383#

An ISSN is an 8-digit code used to identify newspapers, journals, magazines and periodicals of all kinds and on all media–print and electronic.