^Edwards, Sean R. (2012). English Names for British Bryophytes. British Bryological Society Special Volume. Vol. 5 (4 ed.). Wootton, Northampton: British Bryological Society. ISBN978-0-9561310-2-7. ISSN0268-8034.
^Smith, James Edward (1813). English Botany. England: James Sowerby. p. 36.