Books
Understanding Roswell: The true story of what happened in Roswell in July 1947
Understanding Roswell is the first book that dives deeply into the backgrounds of the witnesses, examines the evidence with a dispassionate eye and tells the story in a comprehensive fashion. While it seems that everyone agrees that something fell to the northwest of Roswell, New Mexico in July, 1947, it is the interpretation of that fall that was open for debate. Looking at the evidence provided by the United States Air Force, along with the information uncovered by civilian UFO researchers, all the terrestrial explanations have failed. Written by one of the leading experts on the case, Understanding Roswell eliminates many of the side issues that are clouding the case and narrows its focus to that information that is helpful in understanding the overall picture. For those looking for the truth about the Roswell UFO crash/retrieval, this is the book to bring it into perspective.
See more (external link) 
https://www.amazon.com/UNDERSTANDING-ROSWELL-TRUE-STORY-HAPPENED/dp/B09TMVTXZC