APA

Darwin C., Judd J. W., . (18). On the structure and distribution of coral reefs, also, Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. Beagle. London: Ward, Lock & co.

Chicago

Darwin Charles, Judd John Wesley, . 18. On the structure and distribution of coral reefs, also, Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. Beagle. London: Ward, Lock & co.

Harvard

Darwin C., Judd J. W., . (18). On the structure and distribution of coral reefs, also, Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. Beagle. London: Ward, Lock & co.

MLA

Darwin Charles, Judd John Wesley, . On the structure and distribution of coral reefs, also, Geological observations on the volcanic islands and parts of South America visited during the voyage of H.M.S. Beagle. London: Ward, Lock & co. 18.