APA (7th ed.) Citation

Nybelin, O., & Nielsen, E. (1949). Studies on triassic fishes. Reitzel.

Chicago Style (17th ed.) Citation

Nybelin, Orvar, and Eigil Nielsen. Studies on Triassic Fishes. København: Reitzel, 1949.

MLA (9th ed.) Citation

Nybelin, Orvar, and Eigil Nielsen. Studies on Triassic Fishes. Reitzel, 1949.