[en] [Gutenberg 34006] • Rustic Sounds, and Other Studies in Literature and Natural History Createspace Independent Publishing Platform
[en] Selected Letters on Evolution and Origin of Species Dover Publications
[en] [Gutenberg 2010] • The Autobiography of Charles Darwin W.W. Norton & Company
[en] On the Origin of Species, 6th Edition MobileReference
[es] Autobiografía
[en] The Autobiography of Charles Darwin · From the Life and Letters of Charles Darwin Createspace Independent Publishing Platform