Catalogue of the Birds in the British Museum: Plataleæ (ibises and spoonbills) and Herodiones (herons and storks) by R.B. Sharpe. Steganopodes (cormorants, gannets, frigate-birds, tropic-birds, and pelicans) Pygopodes (divers and grebes) Alcæ (auks) and Impennes (penguins) by W.R. Ogilvie-Grant. 1898
British Museum (Natural History). Department of Zoology