@inbook {470,
	title = {A contribution to the phylogeny and biogeography of the freshwater triclads (Platyhelminthes, Turbellaria)},
	booktitle = {Biology of the Turbellaria},
	year = {1974},
	pages = {339-401},
	publisher = {McGraw-Hill},
	organization = {McGraw-Hill},
	address = {New York},
	author = {Ian R. Ball}
}
@book {582,
	title = {British Planarians},
	year = {1981},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	address = {Cambridge},
	author = {Ian R. Ball and T. B. Reynoldson}
}
