@book {683,
	title = {American Arctic Lichens I. The Macrolichens},
	year = {1984},
	publisher = {Columbia University Press},
	organization = {Columbia University Press},
	issn = {0231058888, 9780231058889},
	author = {Thomson, John Walter and Bethia Brehmer}
}
@book {47,
	title = {The Lichen Flora of Great Britian and Ireland},
	year = {1992},
	publisher = {Natural History Museum Publications},
	organization = {Natural History Museum Publications},
	address = {London},
	author = {O.W. Purvis and D.M. Moore and B.J. Coppins and D.L. Hawksworth and P.W. James}
}
@book {1453,
	title = {Lichens},
	series = {The new naturalist},
	year = {2000},
	pages = {288},
	publisher = {HarperCollins},
	organization = {HarperCollins},
	address = {London},
	isbn = {0002200821},
	author = {Oliver Gilbert}
}
