De La Beche, Henry T. “Anniversary Address of the President”. Quarterly Journal of the Geological Society, vol. 5, no. 1-2, https://doi.org/10.1144/gsl.jgs.1849.005.01-02.03.
De La Beche, H. T. (n.d.). Anniversary Address of the President. Quarterly Journal of the Geological Society, 5(1-2). https://doi.org/10.1144/gsl.jgs.1849.005.01-02.03
De La Beche, Henry T. “Anniversary Address of the President”. Quarterly Journal of the Geological Society 5, no. 1-2 (n.d.). https://doi.org/10.1144/gsl.jgs.1849.005.01-02.03.
De La Beche HT. Anniversary Address of the President. Quarterly Journal of the Geological Society. 5(1-2).