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