Poulsen, V. (1963). Ctenopyge <Ctenopyge> pecten tenuis n.subsp. from the upper Cambrian of Bornholm. Munksgaard.
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Citação norma Chicago
Poulsen, Valdemar. Ctenopyge <Ctenopyge> Pecten Tenuis N.subsp. from the Upper Cambrian of Bornholm. København: Munksgaard, 1963.
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Citação norma MLA
Poulsen, Valdemar. Ctenopyge <Ctenopyge> Pecten Tenuis N.subsp. from the Upper Cambrian of Bornholm. Munksgaard, 1963.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.