Brisson, Mathurin Jacques (1760). Ornithologie, ou, Méthode Contenant la Division des Oiseaux en Ordres, Sections, Genres, Especes & leurs Variétés (in French and Latin). Paris: Jean-Baptiste Bauche. Vol. 1, p. 46, Vol. 5, p. 33.
Bickart, K. J. (1990). "Part I: The Birds of the Late Miocene-Early Pliocene Big Sandy Formation, Mohave County, Arizona". Ornithological Monographs (44): 1–72. doi:10.2307/40166673. JSTOR40166673.
jstor.org
Bickart, K. J. (1990). "Part I: The Birds of the Late Miocene-Early Pliocene Big Sandy Formation, Mohave County, Arizona". Ornithological Monographs (44): 1–72. doi:10.2307/40166673. JSTOR40166673.