Stinnesbeck, W. (2008). Comment on “The oldest stratigraphic record of the Late Cretaceous shark Ptychodus mortoni Agassiz, from Vallecillo, Nuevo León, northeastern Mexico” by Blanco-Piñón et al. , Rev. Mex. Cienc. Geol. (2007), 24, 25-30. Universidad Nacional Autónoma de México.
Citazione stile Chigago Style (17a edizione)Stinnesbeck, Wolfgang. Comment on “The Oldest Stratigraphic Record of the Late Cretaceous Shark Ptychodus Mortoni Agassiz, from Vallecillo, Nuevo León, Northeastern Mexico” by Blanco-Piñón Et Al. , Rev. Mex. Cienc. Geol. (2007), 24, 25-30. Universidad Nacional Autónoma de México, 2008.
Citatione MLA (9a ed.)Stinnesbeck, Wolfgang. Comment on “The Oldest Stratigraphic Record of the Late Cretaceous Shark Ptychodus Mortoni Agassiz, from Vallecillo, Nuevo León, Northeastern Mexico” by Blanco-Piñón Et Al. , Rev. Mex. Cienc. Geol. (2007), 24, 25-30. Universidad Nacional Autónoma de México, 2008.