Van Loon, A.J. 1971. «The Stratigraphy of the Westphalian C Around Prioro (prov. León. Spain) (with Paleontological Notes by G.E. De Groot, H.W.J. Van Amerom and R.H. Wagner)». Trabajos De Geología 3 (3):231-67. https://doi.org/10.17811/tdg.3.1971.231-267.