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Johnsgard, Paul Austin 1931-2021, Dana Gordon 1950- Gardner, James D. McClelland, John O'Neill, and David Reiser. Trogons and Quetzals of the World. Washington: Smithsonian Institution Press, 2000.

Johnsgard, Paul Austin 1931-2021, et al. Trogons and Quetzals of the World. Washington: Smithsonian Institution Press, 2000.