Barnes, B. V., Wagner, W. H. 1., & Otis, C. H. (1981). Michigan trees: A guide to the trees of Michigan and the Great Lakes region (Revised and enlarged edition of Charles Herbert Otis´s.). Ann Arbor: The University of Michigan Press.
Citación estilo ChicagoBarnes, Burton V., Warren Herbert 1920-2000 Wagner, y Charles Herbert Otis. Michigan Trees: A Guide to the Trees of Michigan and the Great Lakes Region. Revised and enlarged edition of Charles Herbert Otis´s. Ann Arbor: The University of Michigan Press, 1981.
Cita MLABarnes, Burton V., Warren Herbert 1920-2000 Wagner, y Charles Herbert Otis. Michigan Trees: A Guide to the Trees of Michigan and the Great Lakes Region. Revised and enlarged edition of Charles Herbert Otis´s. Ann Arbor: The University of Michigan Press, 1981.