Ludvigsen, R. (1982). Upper cambrian and lower Ordovician trilobite biostratigraphy of the Rabbitkettle formation, Western district of Mackenzie. Royal Ontario Museum.
Chicago Style (17th ed.) CitationLudvigsen, Rolf. Upper Cambrian and Lower Ordovician Trilobite Biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie. Toronto: Royal Ontario Museum, 1982.
MLA (9th ed.) CitationLudvigsen, Rolf. Upper Cambrian and Lower Ordovician Trilobite Biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie. Royal Ontario Museum, 1982.
Warning: These citations may not always be 100% accurate.