Published in Bulletin of the British Ornithologists' Club, in 1957, in volume 77, pages 10-16

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 24-25

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 26-29

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 44-46

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 49-52

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 58-60

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 99-102

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 102

Published in Bulletin of the British Ornithologists' Club, in 1957, in volume 77, pages 103

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 153-154

Published in Bulletin of The British Ornithologists' Club, in 1957, in volume 77, pages 155-156