APA ציטוט

Ludvigsen, R. (1978). The trilobites Bathyurus and Eomonorachus from the Middle Ordovician of Oklahoma and their biofacies significance. Royal Ontario Museum.

Chicago Style (17th ed.) Citation

Ludvigsen, Rolf. The Trilobites Bathyurus and Eomonorachus from the Middle Ordovician of Oklahoma and Their Biofacies Significance. Toronto: Royal Ontario Museum, 1978.

ציטוט MLA

Ludvigsen, Rolf. The Trilobites Bathyurus and Eomonorachus from the Middle Ordovician of Oklahoma and Their Biofacies Significance. Royal Ontario Museum, 1978.