↑ Ernst Heinrich Philipp August Haeckel, Edwin Ray Lankester, L. Dora Schmitz (1892). The History of Creation, Or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes: A Popular Exposition of the Doctrine of Evolution in General, and of that of Darwin, Goethe, and Lamarck in Particular : from the 8. German Ed. of Ernst Haeckel. D. Appleton. pp. 422. http://books.google.com/books?id=ltUj8vk3auEC. page 289 ^ Konrad Guenther, Bernard Miall (1931). A Naturalist in Brazil: The Record of a Year's Observation of Her Flora, Her Fauna, and Her People. Houghton Mifflin Company. pp. 399. page 275
