Can someone find me sources for

Question

Involvement
Cause

of the great depression. I found some but they are not enough.

Answer 1

Here are a bunch of sites:

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=Causes+of+the+Great+Depression&btnG=Google+Search&aq=f&oq=

Answer 2

You should also find a book --

The Forgotten Man by Amity Shlaes
http://books.google.com/books?q=amity+shlaes

It's not available online, but should be in you nearest library.

Answer 3

And The Grapes of Wrath by Steinbeck.