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  1. Silurian trilobites from the northern Yukon Territory /
    By: Ludvigsen, Rolf. - Tripp, Ronald P. - Royal Ontario Museum.
    Publication info: Toronto :Royal Ontario Museum,1990. c1989.
    Contributed by: Royal Ontario Museum (archive.org)
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  2. The type species of the Ordovician trilobite genus Isotelus I. gigas Dekay, 1824 /
    By: Rudkin, David M., - Tripp, Ronald P. - Royal Ontario Museum.
    Publication info: Toronto :Royal Ontario Museum,1988.
    Contributed by: Royal Ontario Museum (archive.org)
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