Alberto,
The book Nicholas and Alexandra- the last Imperial Family of Tsarist Russia is absolutely worth buying!
It is a catalogue of the N&A exhibition from the State Hermitage Museum and the SARF.
Not only about the IF but also detailed descriptions of paintings, furniture, costumes, icons etc etc. I love it!!
I know books are expensive and not everyone can afford them, but the books mentioned before are real must haves. You pick them up time after time, not only reading, also just looking at the photo's. These are not books you read in one or two days. It would be a pity to get them over and over from the library. Try to buy them secondhand, Ebay or other channels, saves you a lot of money.
I got this book really cheap in an outlet store. I don't know how others feel, but I can be as happy as a child when I finally lay hands on the book, I was searching, for a reasonable price.
Anna