(1982). The Ordovician system in southwestern Europe (France, Spain, and Portugal): Correlation chart and explanatory notes.
Chicago-Zitierstil (17. Ausg.)The Ordovician System in Southwestern Europe (France, Spain, and Portugal): Correlation Chart and Explanatory Notes. Ottawa, 1982.
MLA-Zitierstil (9. Ausg.)The Ordovician System in Southwestern Europe (France, Spain, and Portugal): Correlation Chart and Explanatory Notes. 1982.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.