Harshberger, J. W., & Drude, O. (1911). Phytogeographic survey of North America: A consideration of the phytogeography of the North American continent, including Mexico, Central America and the West Indies, together with the evolution of North American plant distribution. Engelmann [u.a.].
Chicago-Zitierstil (17. Ausg.)Harshberger, John William, und Oscar Drude. Phytogeographic Survey of North America: A Consideration of the Phytogeography of the North American Continent, Including Mexico, Central America and the West Indies, Together with the Evolution of North American Plant Distribution. Leipzig: Engelmann [u.a.], 1911.
MLA-Zitierstil (9. Ausg.)Harshberger, John William, und Oscar Drude. Phytogeographic Survey of North America: A Consideration of the Phytogeography of the North American Continent, Including Mexico, Central America and the West Indies, Together with the Evolution of North American Plant Distribution. Engelmann [u.a.], 1911.