"Manx Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved January 20, 2019. http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=MANX ↩
Isle of Man solid and drift geology, 1:50,000 scale. British Geological Survey, NERC. 2001. ISBN 0751833266. 0751833266 ↩