This is the part of the Open Science Foundation that parses citations in various formats.

cat > citation.txt
1. Monty P, Circus F (1969) How Not To Be Seen.  Now For Something
Completely Different 9: 296–305. doi: 42.1024/c.l.py.
^D

citebite citation.txt

{
    ...
}

The output follows the schema defined here: https://github.com/citation-style-language/schema/blob/master/csl-data.json

Grammars for various formats are in the grammars/ subfolder.