Lyell Ch.Principles of geologyАрхивная копия от 13 апреля 2013 на Wayback Machine: being an attempt to explain the former changes of the earth’s surface, by reference to causes now in operation. Vol. 1. London: John Murray, 1830. p. 98.
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England, Philip; Molnar, Peter; Richter, Frank. John Perry's neglected critique of Kelvin's age for the Earth: A missed opportunity in geodynamics (англ.) // GSA Today : journal. — 2007. — Vol. 17. — P. 4. — doi:10.1130/GSAT01701A.1.
Lyell Ch.Principles of geologyАрхивная копия от 13 апреля 2013 на Wayback Machine: being an attempt to explain the former changes of the earth’s surface, by reference to causes now in operation. Vol. 1. London: John Murray, 1830. p. 98.