Published in Bulletin of The British Ornithologists' Club, in 2010, in volume 130, issue 3, pages 154-165
Created: 2015-05-17, modified: 2015-05-17
Published in Forktail, in 1987, in volume 3, pages 67-68
Created: 2019-05-12, modified: 2019-05-12
Published in Bulletin of the British Ornithologists' Club, in 2010, in volume 130, issue 3, pages 166-180
Created: 2015-05-17, modified: 2015-07-13