Full disclosure, I know the guy who wrote it so I'm biased, but Busby Babes by Richard Skinner is a great read for people who want to know more about that period. This is the book on Amazon https://www.amazon.co.uk/Busby-Babes-Richard-Skinner/dp/1910692573/ref=sr_1_1?ie=UTF8&qid=1473160908&sr=8-1&keywords=busby+babes
I know the author even got sent a big Busby portrait by his surviving family because they were so happy with the job he did on the book.