APA

Poulsen C., . (1974). Silurian Pelecypoda, Monoplacophora, and Gastropoda from the reefy facies of the Offley Island formation of Washington Land and Offley Island (Nothwest Greenland). København: Munksgaard.

Chicago

Poulsen Christian, . 1974. Silurian Pelecypoda, Monoplacophora, and Gastropoda from the reefy facies of the Offley Island formation of Washington Land and Offley Island (Nothwest Greenland). København: Munksgaard.

Harvard

Poulsen C., . (1974). Silurian Pelecypoda, Monoplacophora, and Gastropoda from the reefy facies of the Offley Island formation of Washington Land and Offley Island (Nothwest Greenland). København: Munksgaard.

MLA

Poulsen Christian, . Silurian Pelecypoda, Monoplacophora, and Gastropoda from the reefy facies of the Offley Island formation of Washington Land and Offley Island (Nothwest Greenland). København: Munksgaard. 1974.