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Janet Browne (2007). Darwin's Origin of Species: A Biography. ISBN 978-0-87113-953-5

David N. Reznick (2009) The Origin Then and Now: An Interpretive Guide to the Origin of Species  ISBN 978-0-691-12978-5.

. Extract from Proceedings of the American Academy of Arts and Sciences 4 (1860): 411–415.

The Complete Works of Charles Darwin Online:

Table of contents, bibliography of On the Origin of Species – links to text and images of all six British editions of The Origin of Species, the 6th edition with additions and corrections (final text), the first American edition, and translations into Danish, Dutch, French, German, Polish, Russian and Spanish.

Online Variorum, showing every change between the six British editions.

The Origin of Species: An Outline, A short, accessible outline of the book.

Origin of Species, full text with embedded audio.