THE DEATH OF MONEY An updated sequel to a previous book on this subject from:James Rickards. Solid history of things that go CRASH. When history is repeated without learning from it the same things come once again. For a good background plus many examples and insights and guidance about how to meet this eventuality you must get this book.
House Of Debt: from Amir Sufi & Atif Mian both economics professors at USA universities. House Of Debt video
The Crash of 2016: from Tom Hartman