Douglas, D., Wilks, W., & Hutchinson, H. R. (1914). Journal kept by David Douglas during his travels in North America, 1823-1827: Together with a particular description of thirty-three species of American oaks and eighteen species of Pinus, with appendices containing a list of the plants introduced by Douglas and an account of his death in 1834. W. Wesley.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Douglas, David, W. Wilks, و H. R. Hutchinson. Journal Kept by David Douglas During His Travels in North America, 1823-1827: Together with a Particular Description of Thirty-three Species of American Oaks and Eighteen Species of Pinus, with Appendices Containing a List of the Plants Introduced by Douglas and an Account of His Death in 1834. London: W. Wesley, 1914.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Douglas, David, et al. Journal Kept by David Douglas During His Travels in North America, 1823-1827: Together with a Particular Description of Thirty-three Species of American Oaks and Eighteen Species of Pinus, with Appendices Containing a List of the Plants Introduced by Douglas and an Account of His Death in 1834. W. Wesley, 1914.