Lyell, C. (2010). Principles of geology: An attempt to explain the former changes of the earth's Surface, by reference to causes now in Operation. Cambridge University Press. https://doi.org/10.1017/CBO9780511701566

Lyell, Charles. Principles of Geology: An Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation. Cambridge: Cambridge University Press, 2010. https://doi.org/10.1017/CBO9780511701566.

Lyell, Charles. Principles of Geology: An Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation. Cambridge University Press, 2010. https://doi.org/10.1017/CBO9780511701566.