You need it in order to cite your sources and give create to the creator of the source. You also need to know who the creator of the source is since you need to know if they are trustworthy or not. For example, an anonymous creator might give false info. And you also need to see if the person is bias or trusted.
In order for us to make sure of it, i.e. to make sure of the validity of the information because we cannot rely on any source without making sure of its source and the validity of the information and the existing data
The work by Leo Tolstoy which was based on his time serving in the Crimean War and set in the city where he and his unit were based is the <em>Sevastapol Sketches</em>. He recounted his experiences and observations during the war in this novel.
