Geological observations on South America : being the third part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836

MLA

Darwin, Charles, George Brettingham Sowerby and Edward Forbes. Geological observations on South America : being the third part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836. London : Smith, Elder, 1846.

APA

Darwin, C., Sowerby, G. & Forbes, E. (1846). Geological observations on South America : being the third part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836. London : Smith, Elder.

Chicago

Darwin, Charles, George Brettingham Sowerby and Edward Forbes. Geological observations on South America : being the third part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836. London : Smith, Elder, 1846.