@book {466,
	title = {Pondweeds of Great Britain and Ireland},
	series = {BSBI Handbook},
	volume = {8},
	year = {1995},
	pages = {350},
	publisher = {Botanical Society of the British Isles},
	organization = {Botanical Society of the British Isles},
	address = {London},
	author = {Preston, C.D.}
}
