The Secret of World History is a great book which is authored by Leopold von Ranké.
Leopold von Ranké :
Historiography of the nineteenth century was greatly influenced by the thoughts of Leopold von Ranké was from Berlin university. He spoke about the critical method of historical research. He emphasized the utmost importance of information gathered through original documents. He also stated that all types of documents associated with a historical event need to be examined with the greatest care. He believed that with this method it was possible to reach the historical truth. He criticized the imaginative narration of history.