@article {653,
	title = {The Lichen Family Heppiaceae in North America},
	journal = {Annals of the Missouri Botanical Garden},
	volume = {57},
	number = {2},
	year = {1970},
	pages = {158-209},
	chapter = {158},
	url = {http://www.jstor.org/stable/pdfplus/2395109.pdf},
	author = {Wetmore, Clifford M.}
}
@article {1162,
	title = {The lichen genera Heppia and Peltula in Australia},
	journal = {Muelleria},
	volume = {6},
	number = {6},
	year = {1988},
	pages = {495-517},
	chapter = {495},
	author = {Rex B. Filson}
}
@book {724,
	title = {Macrolichens of East Africa},
	year = {1988},
	publisher = {Henry Ling Ltd, The Dorset Press},
	organization = {Henry Ling Ltd, The Dorset Press},
	address = {Dorchester},
	isbn = {0-565-01039-5},
	author = {T.D.V. Swinscow and Krog, Hildur}
}
@book {1290,
	title = {The Lichens of Italy: An annotated catalogue},
	series = {Museo Regionale Di Scienze Naturali},
	volume = {12},
	year = {1993},
	address = {Torino},
	issn = {88-86041-02-0},
	author = {P.L. Nimis}
}
@book {1453,
	title = {Lichens},
	series = {The new naturalist},
	year = {2000},
	pages = {288},
	publisher = {HarperCollins},
	organization = {HarperCollins},
	address = {London},
	isbn = {0002200821},
	author = {Oliver Gilbert}
}
@article {643,
	title = {A Lichenological Comparison of the Paros and Santorini Island Groups (Aegean, Greece), with Annotated Checklist},
	journal = {Willdenowia},
	volume = {29},
	number = {1/2},
	year = {1999},
	month = {12/1999},
	pages = {239-297},
	chapter = {239},
	url = {http://www.jstor.org/stable/3997305},
	author = {Harrie J. M. Sipman and Thomas Raus}
}
@book {50,
	title = {Lichen Flora of the Greater Sonoran Desert Region},
	volume = {1},
	year = {2001},
	publisher = {Lichens Unlimited},
	organization = {Lichens Unlimited},
	address = {Tempe},
	author = {Thomas H. Nash_III and Bruce D. Ryan and Corinna Gries and Frank Bungartz}
}
@article {692,
	title = {The saxicolous and terricolous, cyanobacterial lichens of Socotra (Yemen, Indian Ocean)},
	journal = {Nova Hedwigia},
	volume = {77},
	number = {1-2},
	year = {2003},
	month = {08/2003},
	pages = {73-97},
	author = {Matthias Schultz}
}
@book {1154,
	title = {The Macrolichens of New England},
	series = {Memoirs of the New York Botanical Garden},
	volume = {96},
	year = {2007},
	publisher = {The New York Botanical Garden Press},
	organization = {The New York Botanical Garden Press},
	address = {China},
	author = {James W. Hinds and Patricia L. Hinds}
}
