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 Bulletin of the British Ornithologists' Club, in 2010, in volume 130, issue 3, pages 166-180

Created: 2015-05-17, modified: 2015-07-13

Published in Forktail, in 1987, in volume 3, pages 67-68

Created: 2019-05-12, modified: 2019-05-12