Say, T. (1823). «Taxonomical footnotes». En James, E.P., ed. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20: by order of the Hon. J.C. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party(en inglés). 2: 1–442; i–xcviii. Filadelfia: H.C. Carey & I Lea. Tyrannus verticalis, p. 60 pie de página. Disponible en Biodiversitas Heritage Library. doi:10.5962/bhl.title.61116.
Say, T. (1823). «Taxonomical footnotes». En James, E.P., ed. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20: by order of the Hon. J.C. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party(en inglés). 2: 1–442; i–xcviii. Filadelfia: H.C. Carey & I Lea. Tyrannus verticalis, p. 60 pie de página. Disponible en Biodiversitas Heritage Library. doi:10.5962/bhl.title.61116.
doi.org
Gamble, L.R.& Bergin, T.M. (2020). «Western Kingbird (Tyrannus verticalis), version 1.0.». En poole, A.F., ed. Birds of the World(en inglés). Cornell Lab of Ornithology, Ithaca, NY, USA. Consultado el 21 de agosto de 2023.
