Sarjeant and Anderson, 1969
From dinoflaj3
Sarjeant, W.A.S. and Anderson, R.Y., 1969: A re-examination of some dinoflagellate cysts from the uppermost Lewis Shale (Late Cretaceous) New Mexico (U.S.A.). Review of Palaeobotany and Palynology, v.9, p.229-237, pl.1.