Keller, P. (1928). Pollenanalytische Untersuchungen an Schweizer Mooren.
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Citação norma Chicago
Keller, Paul. Pollenanalytische Untersuchungen an Schweizer Mooren. Zürich, 1928.
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Citação norma MLA
Keller, Paul. Pollenanalytische Untersuchungen an Schweizer Mooren. 1928.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.