@inbook{WoRMS:SourceID:260695,
author = {Sowerby, G. B. II},
title = {Monograph of the genus Cytheraea. In G. B. Sowerby II (ed.), Thesaurus conchyliorum, or monographs of genera of shells. Vol. 2 (12): 611-648, pl. 127-136. London, privately published.
},
url = {http://biodiversitylibrary.org/page/43936974},
year = {1851}
}