List of sources:
Clinning, C. Southern African bird names explained. Johannesburg: Southern African Ornithological Society, 1989.
Hocky, P.A.R. et al (eds). Roberts birds of southern Africa, 7th ed. Cape Town: John Voelcker Bird Book Fund, 2005.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Neergaard, P.
Neergaard. In Beolens, B., Watkins, M. & Grayson, M. The eponym dictionary of birds.
Bloomsbury Publishing, 2014.