Arnold, David (2006) The Tropics and the Traveling Gaze: India, Landscape, and Science, 1800–1856 University of Washington Press, Seattle, pp. 156–157 [Архівовано 27 липня 2014 у Wayback Machine.], ISBN 0-295-98581-X.
Arnold, David (2006) The Tropics and the Traveling Gaze: India, Landscape, and Science, 1800–1856 University of Washington Press, Seattle, pp. 156–157 [Архівовано 27 липня 2014 у Wayback Machine.], ISBN 0-295-98581-X.