Books, Brochures, and Chapters>Book:  Darwin , Huxley , Darwin (1898), On the Reception of the Origin of Species, The Life and Letters of Charles Darwin, Including an Autobiographical Chapter , Retrieved on 2012-06-05

Source Material [books.google.com]

Books, Brochures, and Chapters>Book:  Darwin , Charles (1902), His life told in an autobiographical chapter, and in a selected series of his published letters, Retrieved on 2012-03-23

Source Material [books.google.com]

Books, Brochures, and Chapters>Book:  Darwin , Charles (2008), The Expression of Emotions in Man and Animals, MobileReference, Retrieved on 2012-03-23

Source Material [books.google.com]

Books, Brochures, and Chapters>Book:  Darwin , Charles (1887), Journal of researches into the natural history and geology of the countries visited during the voyage of H. M. S. Beagle round the world, Retrieved on 2012-03-23

Source Material [books.google.com]

Books, Brochures, and Chapters>Book:  Darwin , Charles (2011-08-03), The Autobiography of Charles Darwin, CreateSpace, Retrieved on 2011-09-16

Books, Brochures, and Chapters>Book:  Darwin , Charles (1911), On the origin of species by means of natural selection,: Or, The preservation of favoured races in the struggle for life, Hurst, Retrieved on 2011-05-20

Source Material [www.literature.org]

Books, Brochures, and Chapters>Book:  Darwin , Charles (2010-01-14), The Descent of Man, Dover Publications, Retrieved on 2011-05-18

Source Material [books.google.com]