Darwin Charles. (1890). Journal of researches into the natural history and geology of the countries visited during the voyage of H.M.S. Beagle, round the world, under the command of captain Fitz Roy, R.N. By Charles Darwin, M.A., F.R.S. From the corrected and enlarged edition of 1845. With a biographical introduction. Ninth edition (9a. ed.). Ward, Lock and Co.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Darwin Charles. Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage of H.M.S. Beagle, Round the World, Under the Command of Captain Fitz Roy, R.N. By Charles Darwin, M.A., F.R.S. From the Corrected and Enlarged Edition of 1845. With a Biographical Introduction. Ninth Edition. 9a. ed. Londres: Ward, Lock and Co, 1890.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Darwin Charles. Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage of H.M.S. Beagle, Round the World, Under the Command of Captain Fitz Roy, R.N. By Charles Darwin, M.A., F.R.S. From the Corrected and Enlarged Edition of 1845. With a Biographical Introduction. Ninth Edition. 9a. ed. Ward, Lock and Co, 1890.