Here is a Scotland book recommendation list from ROAD SCHOLAR travel site:

1.   Scotland: The Autobiography, by Rosemary Goring (editor)
2.   Scotland: The Story of a Nation, by Magnus Magnusson
3.   Castle and Tower Houses of the Scottish Clans, by Stuart Reid
4.   Edinburgh, A Cultural History, by Donald Campbell
5.   Culloden, by John Prebble
6.   Scottish Highlanders: A People and their Place, by James Hunter
7.   Book Lovers' Edinburgh: A Guide and Companion, by Allan Foster
8.   The Highland Clearances, by John Prebble
9.   Wild Voices: Journeys Through Time in the Scottish Highlands, by Mike Cawthorne
10.   The Scottish Nation: 1700-2000, by T.M. Devine
11.   The Highland Clans, by Alistair Moffat
12.   Scotland: A Concise History, by Sir Fitzroy Maclean and Magnus Linklater