Maps, plans and archives
Roy W. (surveyed 1747-52) Military Survey of Scotland – Highlands.
Thomson J. (1824) Southern Part of Argyll Shire, John Thomson's Atlas of Scotland 1832: Edinburgh
Ordnance Survey (surveyed, 1865; published 1870) Argyll and Bute Sheet CXCII.5 (South Knapdale) 1st Edition, 25 inches to 1 mile. Ordnance Survey: Southampton
Ordnance Survey (revised, 1898; published 1899) Argyll 192.05 (includes: South Knapdale) 2nd Edition, 25 inches to 1 mile. Ordnance Survey: Southampton
National Library of Scotland, William Henry Playfair Collection, MS 9704 - 2nd Nov 1843
Printed sources
Hooker, J. D. (1849) The Rhododendrons of Sikkim-Himalaya. London: Benham and Reeve.
Groome, F.H. 1882, Ordnance Gazetteer of Scotland, Volume VI. London: William Mackenzie, p.400.
Maxwell, Sir H. (1911) Scottish Gardens - Being a Representative Selection of Different Types, Old and New. London: pp.61-64.
Walker, Fraser and Steele (1948) Particulars and conditions of sale of the sporting, residential and agricultural estate of Stonefield.
Hannah, D.G. (1960s) Stonefield Castle Hotel – Plant Guide. Copy held at Stonefield Castle Hotel.
Webster and Co. (1983) Stonefield Castle Hotel: Sale Particulars. Glasgow.
Armstrong, G.S. (1996) Stonefield Castle Hotel and Gardens. Privately published, copies held at Stonefield Castle Hotel and at Royal Botanic Gardens Edinburgh Library.
Ritchie and Harman, [J N] G and M. (1996) Argyll and the Western Isles, Exploring Scotland's Heritage series, ed. by Anna Ritchie. 2nd. Edinburgh, pp.44-45.
Devlin, F. (2016) Stonefield Castle Hotel – A Case for Regeneration. Copy held at Stonefield Castle Hotel.
Online sources
Tree Register of the British Isles (TROBI) -http://www.treeregister.org/membership/search_county.php [accessed 13/12/2017].
Monumental Trees -https://www.monumentaltrees.com/en/gbr/scotland/argyllandbute/7367_stonefieldcastle/ [accessed 13/12/2017].
Andrews, S. Tree of the Year: Magnolia Campbellii - http://www.dendrology.org/site/images/web4events/pdf/Tree%20info%20IDS_05_pp7_p28_TreeoftheYear.pdf [accessed 13/12/2017].
Ordnance Survey Name Books – Argyll - https://scotlandsplaces.gov.uk/digital-volumes/ordnance-survey-name-books/argyll-os-name-books-1868-1878/argyll-volume-27/52 [accessed 13/12/2017].