Immel, H. (1978). Die Crioceratiten (Ancyloceratina, Ammonoiden) des mediterranen und borealen Hauterive-Barreme (Unterkreide): = The crioceratites (Ancyloceratina, Ammonoidea of Tethyan and Boreal Hauterivian-Barremian Lower Cretaceous. Schweizerbart.
Chicago-Zitierstil (17. Ausg.)Immel, Harald. Die Crioceratiten (Ancyloceratina, Ammonoiden) Des Mediterranen Und Borealen Hauterive-Barreme (Unterkreide): = The Crioceratites (Ancyloceratina, Ammonoidea of Tethyan and Boreal Hauterivian-Barremian Lower Cretaceous. Stuttgart: Schweizerbart, 1978.
MLA-Zitierstil (9. Ausg.)Immel, Harald. Die Crioceratiten (Ancyloceratina, Ammonoiden) Des Mediterranen Und Borealen Hauterive-Barreme (Unterkreide): = The Crioceratites (Ancyloceratina, Ammonoidea of Tethyan and Boreal Hauterivian-Barremian Lower Cretaceous. Schweizerbart, 1978.