- Online Literature Library - Charles Darwin - The Voyage of the Beagle ...www.literature.org/authors/darwin-charles/the-voyage-of-the-beagle
- The Journal of Syms Covington, Assistant to Charles Darwin Esq., on the Second Voyage of the HMS Beagle, December 1831 - September 1836. Part of the resources available through the Bright Sparcs WWW site.www.asap.unimelb.edu.au/bsparcs/covingto
