@book{89441,
	author = {Armitage, Ella Sophia, and Montgomerie, D. H.,},
	title = {The Early Norman Castles of the British Isles.},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Release date is 2015-03-29},
	url = {https://www.gutenberg.org/ebooks/48602}
}