Answer:
You can look for more information for a report on General Custer and the Battle of Little Big Horn in any reliable source for research.
Explanation:
These sources of research can be books, academic journals, historical scientific works, academic websites and university works that deal with the subject that you want to research.
It is important to remember that as the objective of academic works, whether projects, research or reports, dissertations and theses, is always to obtain scientifically based information about a subject, the student or researcher needs to be attentive to evaluate the truth, check the sources and have a critical look at the content found, then use it.