Is there a guide on how the citations are created based on MARC fields?

How can I validate a specific citation that was created, using the bibliographic records as a comparison?

For example, this citation is created using fields: 245a + 245b + 100a.

Kind of a guide book on what fields are considered.

CSL doesn’t use Marc records natively. What software do you refer to? I guess the citations are created by some kind of library catalog?

Answered by email – will post the relevant excerpts later

To Primo and Alma. I guess they have a local library to format then.