↑ del Hoyo, J.; Elliott, A. & Sargatal, J. (editors) (1996) : Handbook of Birds of the World, Volume 3: Hoatzin to Auks. Lynx Edicions, Barcelona. ISBN 84-87334-22-9
1 2 3 Harrison, Peter; Peterson, Roger Tory (1991). Seabirds: A Complete Guide to the Seabirds of the World (Helm Identification Guides) . Christopher Helm Publishers Ltd. ISBN 071363510X.
