Jabarkan Catatan dari The Voyage of the Beagle

Retrieved on 15 December 2006

Retrieved on 30 April 2007

(The Autobiography of Charles Darwin) Retrieved on 15 December 2006

(The Autobiography of Charles Darwin) Retrieved on 15 December 2006

Retrieved on 30 April 2007

Retrieved on 15 December 2006

Retrieved on 15 December 2006

Voyages of the Adventure and Beagle, Volume I –  Retrieved on 30 April 2007

Voyages of the Adventure and Beagle, Volume II –  Retrieved on 15 December 2006

Voyages of the Adventure and Beagle, Volume III –  (The Voyage of the Beagle) Retrieved on 30 April 2007

Voyages of the Adventure and Beagle, Appendix –  Retrieved on 15 December 2006

(The Voyage of the Beagle) Retrieved on 30 April 2007

(The Voyage of the Beagle) Retrieved on 3 August 2014

Bright Sparcs – The Journal of Syms Covington, Assistant to Charles Darwin Esq. on the Second Voyage of HMS Beagle