Bowker, M., & Downs, C. (2008). Breeding incidence of the Great White Pelican <i>Pelecanus onocrotalus</i> and the Pink-backed Pelican <i>P. rufescens</i> in south-eastern Africa from 1933 to 2005. Ostrich: Journal of African Ornithology, 79(1), 23–35. https://doi.org/10.2989/ostrich.2008.79.1.3.360