It is a complete autobiography from the very beginning of his life. I am not sure if it is still in print, but it is very interesting. I have only started the first chapter (titled "It's About Time, You Bum!"), but it definitely looks very promising. There are lots of fantastic pictures in it, and I might have to scan them or something soon. It has a quote at the beginning that I really like.
"There are no rules in film making, only sins. And the cardinal sin is dullness."
Frank Capra directed films such as It's A Wonderful Life, It Happened One Night, Mr. Smith Goes To Washington, and The Philadelphia Story (which is one of those films that I should have seen but haven't).
Expect a review soonish the book is some 500 pages and the book is almost A4 paper sized, so it may take a while to finish considering I still have to finish Wuthering Heights.