Desmond, A. 1997. Huxley: From Devil's Disciple to Evolution's High Priest. Addison-Wesley, Reading, Massachusetts.
di Gregorio, M. A. 1984. T. H. Huxley's Place in Natural Science. Yale University Press, New Haven.
Huxley, T. H. 1859. Letter to Charles Darwin. In; Burkhardt, F. and Smith, S. (eds.) The Correspondence of Charles Darwin. Volume 7: 1858-1859. Cambridge University Press, Cambridge.
Irvine, W. 1955. Apes, Angels, and Victorians: The Story of Darwin, Huxley, and Evolution. McGraw-Hill, New York.
Lyons, S. L. 1995. The origins of T. H. Huxley's saltationism: History in Darwin's shadow. Journal of the History of Biology 28: 463-494.