I'm going to tell the truth as best I can. There is a lot of extra information in the endnotes. These are in a shorthand that any librarian can understand. Sufficient information is given to turn to the exact pages of scientific publications. For reasons of space, authors' names and titles of papers have usually been omitted.
Newspapers are from the UK unless stated.
Use the Index and cross-references. Not everything is referenced. Sometimes a figure or comment has been jotted down and used later although I cannot remember the source. Sometimes the source has been a personal interview. Many reference materials can be ordered from your local library or the librarian can advise you further.