Zirnstein, G. (1980). Charles Lyell. Teubner.
Cita Chicago (17th ed.)Zirnstein, Gottfried. Charles Lyell. Leipzig: Teubner, 1980.
Cita MLA (8th ed.)Zirnstein, Gottfried. Charles Lyell. Teubner, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.