Sollas, W. Johnson. “Some Observations on the Upper Greensand Formation of Cambridge”. Quarterly Journal of the Geological Society, vol. 28, no. 1-2, pp. 397-02, https://doi.org/10.1144/gsl.jgs.1872.028.01-02.47.
Sollas, W. J. (n.d.). Some Observations on the Upper Greensand Formation of Cambridge. Quarterly Journal of the Geological Society, 28(1-2), 397-402. https://doi.org/10.1144/gsl.jgs.1872.028.01-02.47
Sollas, W. Johnson. “Some Observations on the Upper Greensand Formation of Cambridge”. Quarterly Journal of the Geological Society 28, no. 1-2 (n.d.): 397-402. https://doi.org/10.1144/gsl.jgs.1872.028.01-02.47.
Sollas WJ. Some Observations on the Upper Greensand Formation of Cambridge. Quarterly Journal of the Geological Society. 28(1-2):397-402.