Congreve, C. R., & Lieberman, B. S. (2011). Phylogenetic and Biogeographic Analysis of Sphaerexochine Trilobites. Public Library of Science.
Čikaški stil citiranjaCongreve, Curtis R., i Bruce S. Lieberman. Phylogenetic and Biogeographic Analysis of Sphaerexochine Trilobites. Public Library of Science, 2011.
MLA način citiranjaCongreve, Curtis R., i Bruce S. Lieberman. Phylogenetic and Biogeographic Analysis of Sphaerexochine Trilobites. Public Library of Science, 2011.
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