http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Platyhelminthes, Tricladida : keys and notes for the identification of the species
Estuarine and Brackish-water Sciences Association
Ian R. Ball, T.B. Reynoldson : illustrated by Julian Mulock and Maria Tran Thi Vinh-Hao.
Synopses of the British fauna ; new ser., no. 19