Tocher, B.A. and Jarvis, I.,
1987
Dinoflagellate cysts and stratigraphy of the Turonian (Upper Cretaceous) chalk near Beer, southeast Devon, England.
In: Hart, M.B. (editor), Micropalaeontology of Carbonate Environments, p.138-175, pl.9.1-9.3; Ellis Horwood, Chichester, U.K.