Answer:
Research the author’s name and institution to try to find a research agenda or C.V. (academic resume) as this may mention the author’s qualifications.
Step-by-step explanation:
An author's disciplinary affiliation is something that has been built up throughout his academic life, including the teaching institutions, the projects he participated in, the articles previously written, his undergraduate, graduate and any other specialization he had during academic training.
In this case, the best way to find out about disciplinary affiliation is to search the author's name and the institution to try to find a research agenda or C.V. (academic curriculum), as you can mention the author's qualifications.