APA (7th ed.) Citation

Barragán, R., & Maurrasse, F. J. R. Lower Aptian (Lower Cretaceous) ammonites from the basal strata of the La Peña Formation of Nuevo León State, northeast Mexico: Biochronostratigraphic implications. Universidad Nacional Autónoma de México.

Chicago Style (17th ed.) Citation

Barragán, Ricardo, and Florentin J-M. R. Maurrasse. Lower Aptian (Lower Cretaceous) Ammonites from the Basal Strata of the La Peña Formation of Nuevo León State, Northeast Mexico: Biochronostratigraphic Implications. Universidad Nacional Autónoma de México.

MLA (9th ed.) Citation

Barragán, Ricardo, and Florentin J-M. R. Maurrasse. Lower Aptian (Lower Cretaceous) Ammonites from the Basal Strata of the La Peña Formation of Nuevo León State, Northeast Mexico: Biochronostratigraphic Implications. Universidad Nacional Autónoma de México.