Christensen, E.F. 1975. The Søby Flora: Fossil plants from the Middle Miocene delta deposits of the Søby-Fasterholt area, Central Jutland, Denmark. Part I. Danmarks Geologiske Undersøgelse II. Række. 103, (Apr. 1975), 1–41. DOI:https://doi.org/10.34194/raekke2.v103.6894.