Howell, S.N.G. 2012. Petrells, Albatrosses and Storm-Petrels of North America. Princeton University Press, New Jersey, USA. ISBN 978-0-691-14211-1
Howell, S.N.G. 2012. Petrells, Albatrosses and Storm-Petrels of North America. Princeton University Press, New Jersey, USA. ISBN 978-0-691-14211-1