Emily Card et al. 2021. Rediscovery of Rajah Scops-Owl (Otus brookii brookii) on the island of Borneo. The Wilson Journal of Ornithology 132 (3): 769-773; doi:10.1676/20-50
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F. Weick: Owls (Strigiformes): Annotated and Illustrated Checklist. Springer, Berlin/Heidelberg/New York, 2006, ISBN 978-3-540-35234-1, S. 62, (Leseprobe).
