“The whole modern method of historical research is founded upon the distinction between original and derivative authorities. By original authorities we mean either statements by eye-witnesses, or documents, and other material remains, which are contemporary with the events which they attest. By derivative authorities we mean historians or chroniclers who relate and discuss events which they have not witnessed but which they have heard of or inferred directly or indirectly from original authorities.” – Arnaldo Momigliano, Studies in Historiography, 1966 When conducting research, you will often need to find and use specific types of resources.  That could include peer-reviewed work, or to use a book or a video as a reference.  One common and very important type of source students … Continued