Amsden, T. W., & Barrick, J. E. (1988). Late Ordovician through Early Devonian annotated correlation chart and brachiopod range charts for the southern mid-continent region, U.S.A., with a discussion of Silurian and Devonian conodont faunas. Univ. of Oklahoma.
Chicago-Zitierstil (17. Ausg.)Amsden, Thomas W., und James E. Barrick. Late Ordovician Through Early Devonian Annotated Correlation Chart and Brachiopod Range Charts for the Southern Mid-continent Region, U.S.A., with a Discussion of Silurian and Devonian Conodont Faunas. Norman: Univ. of Oklahoma, 1988.
MLA-Zitierstil (9. Ausg.)Amsden, Thomas W., und James E. Barrick. Late Ordovician Through Early Devonian Annotated Correlation Chart and Brachiopod Range Charts for the Southern Mid-continent Region, U.S.A., with a Discussion of Silurian and Devonian Conodont Faunas. Univ. of Oklahoma, 1988.