Published in Bulletin of The British Ornithologists' Club, in 1940, in volume 60, pages 56-57

Published in Bulletin of The British Ornithologists' Club, in 1940, in volume 60, pages 81-82

Published in Bulletin of the British Ornithologists' Club, in 1940, in volume 60, pages 92-93

Published in Bulletin of The British Ornithologists' Club, in 1940, in volume 60, pages 94-95

Published in Bulletin of The British Ornithologists' Club, in 1940, in volume 60, pages 96-97

Published in Bulletin of The British Ornithologists' Club, in 1940, in volume 60, pages 97-98

Published in Bulletin of the British Ornithologists' Club, in 1940, in volume 60, issue 433, pages 91-92