↑ Collins, Billie Jean. 2010 "Animal Mastery in Hittite Art and Texts" in The Master of Animals in Old World Iconography, ed. Derek B. Counts and Bettina Arnold, pp. 59-74. Main Series, Number 24, Archaeolingua Foundation, Budapest.
↑ Reconstructed by the Abegg Stiftung Riggisberg, Switzerland. P. Ackermann: A Gold-woven Byzantine Silk of the Tenth Century. In: Revue des Arts Asiatiques X, 1936, 87-88. D.G. Sheperd: A mediaeval brocade. In: Bulletin of the Cleveland Museum of Arts 37, 1950, 195-196; S. Müller-Christensen: Zwei Seidengewebe als Zeugnisse der Wechselwirkung von Byzanz und Islam. In: Artes Minores. Dank an Werner Abegg. Bern, 1973, 22-25.
↑ Stone slab with Double-Headed Eagle, Stara Zagora, Nasionalen Arkheologicheski Muzei, Sofia Inv. nr.B: 854; 10th-11th century, from the time of the Macedonian Empire in Bulgaria (976-1018) or from the time of Byzantine occupation (971-976; 1018-1185) and may be the emblem of rank of the Bulgarian tsar/basileus in Illyricum. Evans, Helen C. & William D. Wixom. Eds. The Glory of the Byzantine Empire. Art and Culture of the Byzantine Era A.D. 843-1261. The Metropolitan Museum of Art, New York, 1997. 326f.
↑ Miniature of the Archangel Michael (killing a devil) and a monk, with a two-headed eagle between the arches, ms. of Pseudo-saint Clément, Recognitiones; Mont Saint-Michel, c. 1000. Avranches, Bibliothèque Municipale ms. 50.
↑ "Mercian History" (dalam bahasa Inggeris). Mercian Volunteers Regimental Association. Diarkib daripada yang asal pada 29 September 2007. Dicapai pada 13 Mei 2013.
↑ Urquhart, R. M. (1973). Scottish Burgh and County Heraldry (dalam bahasa Inggeris). London: Heraldry Today. halaman 108–109. ISBN0900455241.
Soloviev, A.V. (1935). "Les emblèmes héraldiques de Byzance et les Slaves". Seminarium Kondakovianum (dalam bahasa Perancis). 7: 119–164.
