https://www.oclc.org/bibformats/en/6xx/688.html
688 Subject Added Entry--Type of Entity Unspecified
entry typesubjectaddedentityunspecified
https://www.bibtex.com/e/article-entry/
BibTeX entry type: article [with examples] - BibTeX.com
BibTeX article entry: use it for anything that is published in a periodical like journal articles or magazine articles.
bibtex entrywith examplestypearticle