Erritzøe, Johannes; Mann, Clive F.; Brammer, Frederik; Fuller, Richard A. (2012). Cuckoos of the World. Bloomsbury Publishing. p. 170. ISBN978-1-4081-4267-7. Archived from the original on 2016-12-24.
Erritzøe, Johannes; Mann, Clive F.; Brammer, Frederik; Fuller, Richard A. (2012). Cuckoos of the World. Bloomsbury Publishing. p. 170. ISBN978-1-4081-4267-7. Archived from the original on 2016-12-24.