* {{cite book | last=Cannon | first=Lester R.G. | title=Biology of Turbellaria and some Related Flatworms | publisher=Springer Science & Business Media | date=2012-12-06 | isbn=978-94-011-0045-8}}
<ref name="u791">{{cite book | last=Cannon | first=Lester R.G. | title=Biology of Turbellaria and some Related Flatworms | publisher=Springer Science & Business Media | date=2012-12-06 | isbn=978-94-011-0045-8 | page=}}</ref>