Section Falco cærulescens, page 135 IABHL in Horsfield, Thomas (1822). "Systematic arrangement and description of birds from the island of Java. Read April 18, 1820". Transactions of the Linnean Society of London. 13: 135–200. "The drawing of Edwards was made from a bird sent from Bengal. The Javan specimens are somewhat smaller, and differently marked. They appear to form a distinct variety..."
Section Falco cærulescens, page 135 IABHL in Horsfield, Thomas (1822). "Systematic arrangement and description of birds from the island of Java. Read April 18, 1820". Transactions of the Linnean Society of London. 13: 135–200. "The drawing of Edwards was made from a bird sent from Bengal. The Javan specimens are somewhat smaller, and differently marked. They appear to form a distinct variety..."
Sharpe, R. Bowdler (1874). "Microhierax". Volume I: Catalogue of the Accipitres or Diurnal Birds of Prey in the Collection of the British Museum. Catalogue of the Birds in the British Museum. London: Trustees of the British Museum. pp. 366–369.
Drapiez, Auguste (1824). "Faucon". In Bory de Saint-Vincent (ed.). Dictionnaire classique d'histoire naturelle, vol. 6. Paris: Rey & Gravier. Beagle LibraryBHL
