Ussher, W. A. E. “On the Triassic Rocks of Normandy and Their Environments”. Quarterly Journal of the Geological Society, vol. 35, no. 1-4, pp. 245-67, https://doi.org/10.1144/gsl.jgs.1879.035.01-04.12.
Ussher, W. A. E. (n.d.). On the Triassic Rocks of Normandy and their Environments. Quarterly Journal of the Geological Society, 35(1-4), 245-267. https://doi.org/10.1144/gsl.jgs.1879.035.01-04.12
Ussher, W. A. E. “On the Triassic Rocks of Normandy and Their Environments”. Quarterly Journal of the Geological Society 35, no. 1-4 (n.d.): 245-67. https://doi.org/10.1144/gsl.jgs.1879.035.01-04.12.
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Ussher WAE. On the Triassic Rocks of Normandy and their Environments. Quarterly Journal of the Geological Society. 35(1-4):245-67.