Revista mexicana de ciencias geológicas On-line version ISSN 2007-2902Print version ISSN 1026-8774
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STINNESBECK, Wolfgang et al.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. Rev. mex. cienc. geol [online]. 2008, vol.25, n.2, pp.365-366.
ISSN 2007-2902.