1. BROWN, L., and D. AMADON. 1968. Eagles, Hawks and Falcons of the World. London: Country Life.
2. MACDONALD, J. D. 1973. Birds of Australia. London: Witherby.
3. McCLURE, H. E. 1974. Migration and survival of the birds of Asia. Bangkok: Appl. scient. Res. Corp. Thailand.
4. Birds Not Previously Recorded from Timor