@article {81,
	title = {An annotated checklist of the freshwater Tricladida of the Nearctic and Neotropical Regions},
	journal = {Canadian Journal of Zoology},
	volume = {47},
	number = {1},
	year = {1969},
	pages = {59-64},
	chapter = {59},
	doi = {10.1139/z69-013},
	author = {Ian R. Ball}
}
