Jan Feddersen from Hamburg wrote a book about the Eurovision Song Contest. It's only available in German for now.
'Ein Lied kann eine Brücke sein', is the title of the book(just like the German entry of 1975). The book is sold in combination with a CD, wherefor it's still possible to vote which songs will be on it.
The book is being made in co-operation with broadcaster NDR.
More info on the website of the book !