Mayr, Gerald (April 2003). "The phylogenetic affinities of the Shoebill (Balaeniceps rex)". Journal für Ornithologie. 144 (2): 157–175. doi:10.1007/BF02465644. S2CID36046887.
Mayr, Gerald (April 2003). "The phylogenetic affinities of the Shoebill (Balaeniceps rex)". Journal für Ornithologie. 144 (2): 157–175. doi:10.1007/BF02465644. S2CID36046887.