↑ BirdLife International (2008). Botaurus stellaris. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 4 February 2009. Database entry includes justification for why this species is of least concern.
↑ Brazil, Mark, Birds of East Asia: China, Taiwan, Korea, Japan, and Russia (Princeton Field Guides) . Princeton University Press (2009), ISBN 978-0-691-13926-5
