Ptychagnostus (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ptychagnostus" in English language version.

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books.google.com

Brian D. E. Chatterton, Desmond H. Collins & Rolf Ludvigsen (2003). "Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences". In Philip D. Lane, Derek J. Siveter & Richard A. Fortey (ed.). Trilobites and their Relatives: contributions from the third international conference, Oxford 2001. Special Papers in Palaeontology. Vol. 70. pp. 157–173. ISBN 978-0-901702-81-4.

Samuel M. Gon III. "Agnostida Fact Sheet". A Guide to the Orders of Trilobites. Retrieved 18 November 2012.