1. Standard calpionellid zonation (Upper Tithonian-Valanginian) of the Western Mediterranean province;Allemann,1971
2. The stratigraphy of the Taraises Formation, Lower Cretaceous, Mexico;Blauser,1981
3. Zonificatión microfaunística de las calizas cretácicas del Este de México;Bonet,1956
4. Algunas faunas cretacicas de Zacatecas, Durango y Guerrero;Böse;Bol. Inst. Geol. Mexico,1923
5. On the occurence of Calpionellids in Cuba;Bronnimann;Eclogae geol. Helv.,1953