Hirano, Toshiaki. Displays of Japanese Lesser Sparrowhawks during Pre-laying Period. Japanese Journal of Ornithology. 1999, 48 (2): 157–160. ISSN 0913-400X. doi:10.3838/jjo.48.157.
Hirano, Toshiaki. Displays of Japanese Lesser Sparrowhawks during Pre-laying Period. Japanese Journal of Ornithology. 1999, 48 (2): 157–160. ISSN 0913-400X. doi:10.3838/jjo.48.157.