J. A., Doyle, S., Jardiné and A., Doerenkamp: Afropollis, a new genus of early angiosperm pollen, with notes on the Cretaceous palynostratigraphy and palaeoenvironments of northern Gondwana, Bull. Centres Rech. Explor. – Prod. Elf – Aquitaine, 6, 39-117, 1982.

G. F. W., Herngreen and A. F., Chlonova: Cretaceous microfloral provinces, Pollen et Spores, 23, 441-555, 1981.

J., Jansonius and L. V., Hills: Genera file of fossil spores (plus supplements), Spec. Publ. –Dept. Geol. Univ. Calgary, 1976.

J. K., Lentin and G. L., Williams: Fossil dinoflagellates: Index to genera and species, 1981 edition, Report Ser. Bedford Instit. Oceanogr., 1-345, 1981.

C., Singh: Lower Cretaceous microfloras of the Peace River area, northwestern Alberta, Bull. Res. Counc. Alberta, 28, 542-1971.