Kirkby, J. W. “On the Permian Chitonidæ”. Quarterly Journal of the Geological Society, vol. 15, no. 1-2, pp. 607-26, https://doi.org/10.1144/gsl.jgs.1859.015.01-02.69.
Kirkby, J. W. (n.d.). On the Permian Chitonidæ. Quarterly Journal of the Geological Society, 15(1-2), 607-626. https://doi.org/10.1144/gsl.jgs.1859.015.01-02.69
Kirkby, J. W. “On the Permian Chitonidæ”. Quarterly Journal of the Geological Society 15, no. 1-2 (n.d.): 607-26. https://doi.org/10.1144/gsl.jgs.1859.015.01-02.69.
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Kirkby JW. On the Permian Chitonidæ. Quarterly Journal of the Geological Society. 15(1-2):607-26.