Citation Style Language is an XML-based language that is used to describe the formatting of citations and bibliographies.

By extracting metadata from Invenio records in BibTeX or CSL-JSON format and using the `citeproc-py` library it is possible to generate formatted citations of any record.

Repositories and implementations:

• Citeproc Styles:  https://github.com/inveniosoftware/citeproc-py-styles
• Citeproc-py: https://github.com/brechtm/citeproc-py
• AngularJS Frontend: https://github.com/inveniosoftware/invenio-csl-js
• UI helper REST API: https://github.com/inveniosoftware/invenio-csl-rest
• Records-REST Serializer: https://github.com/inveniosoftware/invenio-records-rest/blob/master/invenio_records_rest/serializers/citeproc.py
• Zenodo CSL-JSON Serializer Implementation: https://github.com/zenodo/zenodo/blob/master/zenodo/modules/records/serializers/schemas/csl.py

Citation Formatter Live Example on Zenodo