Published in Bulletin of The British Ornithologists' Club, in 1952, in volume 72, pages 21-22

Published in Bulletin of The British Ornithologists' Club, in 1952, in volume 72, pages 22-33

Published in Bulletin of The British Ornithologists' Club, in 1952, in volume 72, pages 34-36

Published in Bulletin of The British Ornithologists' Club, in 1952, in volume 72, pages 95