BirdLife International (2012). Ardeola bacchus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2.
nih.gov
ncbi.nlm.nih.gov
Though a number of studies have used DNA of A. bacchus, there is almost no comparison data from other Ardeola: GenBank: Ardeola bacchus, Ardeola. Retrieved 2011-JUL-14.