There are not a lot of books about Bhutan comparing with other countries.
This is a very useful guide book to understand Bhutan. You can find the history of every scenic spots, the life style of Bhutanese, and the daily speaking languages for you to get closer to local people.
And there are also many useful maps. If your schedule is not so tight, having time to visit more places than others, the maps would be the best way to check where you can go....Continua