APA (7th ed.) Citation

Ockelmann, W. K. (1954). On the interrelationship and the zoogeography of northern species of Yoldia Möller, S.Str. (Mollusca, fam. Ledidae): With a new subspecies. Reitzel.

Chicago Style (17th ed.) Citation

Ockelmann, W. K. On the Interrelationship and the Zoogeography of Northern Species of Yoldia Möller, S.Str. (Mollusca, Fam. Ledidae): With a New Subspecies. København: Reitzel, 1954.

MLA (9th ed.) Citation

Ockelmann, W. K. On the Interrelationship and the Zoogeography of Northern Species of Yoldia Möller, S.Str. (Mollusca, Fam. Ledidae): With a New Subspecies. Reitzel, 1954.