Describe the importance of the three separate sources of information (answer attached)

Describe the importance of the three separate sources of information from which the investigator seeks the relevant facts needed to reconstruct the past. Additionally, explain the importance of the investigative mind-set and how it can be beneficial to the process of criminal investigation APA Format,Ariel 12 font, double spaced, 2-3 pages with at least 2 references, from the book Criminal Investigation A Method for Reconstructing the Past chapter 13 by James W. Osterburg/ Richard H. Ward