(1) American Architecture Since 1780, revised edition: A Guide to the Styles by Marcus Whiffen ISBN: 9780262730976 MIT Press View at publisher
(2) Highlands and Islands John Gifford ISBN: 9780300096255 Yale University Press View at publisher
(3) Northumberland Nikolaus Pevsner; John Grundy; Grace McCombie; Peter Ryder and Humphrey Welfare ISBN: 9780300096385 Yale University Press View at publisher