(en) Mathews, G.M. 1912. The Birds of Australia II. p. 211 BHL. Gearchiveerd op 12 oktober 2022.
doi.org
dx.doi.org
(en) Masello, J.F.et al.,2022. "Independent evolution of intermediate bill widths in a seabird clade". Molecular Genetics and Genomics. 297 (1): 183–198. DOI:10.1007/s00438-021-01845-3