IUCN: Bostrychia olivacea: BirdLife International: The IUCN Red List of Threatened Species 2016: e.T22697472A93615552. International Union for Conservation of Nature, 1. Oktober 2016, doi:10.2305/iucn.uk.2016-3.rlts.t22697472a93615552.en (iucnredlist.org [abgerufen am 4. Januar 2022]).
iucnredlist.org
IUCN: Bostrychia olivacea: BirdLife International: The IUCN Red List of Threatened Species 2016: e.T22697472A93615552. International Union for Conservation of Nature, 1. Oktober 2016, doi:10.2305/iucn.uk.2016-3.rlts.t22697472a93615552.en (iucnredlist.org [abgerufen am 4. Januar 2022]).