International Union of Geological Sciences. International Subcommission on Stratigraphic Classification & Salvador, A. (1994). International stratigraphic guide: A guide to stratigraphic classification,terminology and procedure (2nd ed.). The Geological Society of America ; IUGS.
Cita Chicago Style (17a ed.)International Union of Geological Sciences. International Subcommission on Stratigraphic Classification y Amos Salvador. International Stratigraphic Guide: A Guide to Stratigraphic Classification,terminology and Procedure. 2nd ed. Colorado: The Geological Society of America ; IUGS, 1994.
Cita MLA (8a ed.)International Union of Geological Sciences. International Subcommission on Stratigraphic Classification y Amos Salvador. International Stratigraphic Guide: A Guide to Stratigraphic Classification,terminology and Procedure. 2nd ed. The Geological Society of America ; IUGS, 1994.