Roosevelt, Theodore. Revealing and concealing coloration in birds and mammals. Bulletin of the American Museum of Natural History. 1911, 30 (Article 8): 119–231 [2024-08-01]. hdl:2246/470. (原始内容存档于2015-01-19). Roosevelt attacks Thayer on page 191, arguing that neither zebra nor giraffe are "'adequately obliterated' by countershading or coloration pattern or anything else."
animaldiversity.org
Myers, P.; Espinosa, R.; Parr, C.S.; Jones, T.; Hammond, G.S.; Dewey, T.A. Botaurus: Brown bitterns. Animal Diversity Web. University of Michigan. [11 November 2015]. (原始内容存档于2016-03-05).
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Gilbert, Gillian; Tyler, Glen A; Smith, Ken. Local annual survival of booming male Great Bittern Botaurus stellaris in Britain, in the period 1990–1999. IBIS. 27 February 2002, 144 (1): 51–61. doi:10.1046/j.0019-1019.2001.00012.x.
Roosevelt, Theodore. Revealing and concealing coloration in birds and mammals. Bulletin of the American Museum of Natural History. 1911, 30 (Article 8): 119–231 [2024-08-01]. hdl:2246/470. (原始内容存档于2015-01-19). Roosevelt attacks Thayer on page 191, arguing that neither zebra nor giraffe are "'adequately obliterated' by countershading or coloration pattern or anything else."
Ledwidge, Francis. Lament for Thomas MacDonagh. Colum, Padraic (编). Anthology of Irish Verse. Boni and Liveright. 1922 [2024-08-01]. (原始内容存档于2022-12-01).
Roosevelt, Theodore. Revealing and concealing coloration in birds and mammals. Bulletin of the American Museum of Natural History. 1911, 30 (Article 8): 119–231 [2024-08-01]. hdl:2246/470. (原始内容存档于2015-01-19). Roosevelt attacks Thayer on page 191, arguing that neither zebra nor giraffe are "'adequately obliterated' by countershading or coloration pattern or anything else."