| New additions to biodiversitylibrary: Pompeckij J.F. (1893) Beiträge zu einer Revision der Ammoniten des Schwäbischen Jura. Lief.1. I. Phylloceras. II. Psiloceras. III. Schlotheimia. Stuttgart: Schweizerbart. 178 S.
http://biodiversitylibrary.org/item/101196#5 Sayn G. (1890) Description des ammonitides du Barrémien du Djebel-Ouach. Lyon, 78 pp.
http://biodiversitylibrary.org/item/101192#7
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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