Hughes, T. McKenny. “Further Observations on the Pre-Cambrian Rocks of Caernarvon”. Quarterly Journal of the Geological Society, vol. 35, no. 1-4, pp. 682-93, https://doi.org/10.1144/gsl.jgs.1879.035.01-04.49.
Hughes, T. M. (n.d.). Further Observations on the Pre-Cambrian Rocks of Caernarvon. Quarterly Journal of the Geological Society, 35(1-4), 682-693. https://doi.org/10.1144/gsl.jgs.1879.035.01-04.49
Hughes, T. McKenny. “Further Observations on the Pre-Cambrian Rocks of Caernarvon”. Quarterly Journal of the Geological Society 35, no. 1-4 (n.d.): 682-93. https://doi.org/10.1144/gsl.jgs.1879.035.01-04.49.
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Hughes TM. Further Observations on the Pre-Cambrian Rocks of Caernarvon. Quarterly Journal of the Geological Society. 35(1-4):682-93.