Mönnig, E.; Dietl, G. (2017). The systematics of the ammonite genus Kepplerites (upper Bathonian and basal Callovian, Middle Jurassic) and the proposed basal boundary stratotype (GSSP) of the Callovian Stage. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 286(3): 235-287.
The systematics of the ammonite genus Kepplerites (upper Bathonian and basal Callovian, Middle Jurassic) and the proposed basal boundary stratotype (GSSP) of the Callovian Stage
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen