Published in Bulletin of The British Ornithologists' Club, in 1927, in volume 47, pages 74-75
Published in Bulletin of The British Ornithologists' Club, in 1927, in volume 47, pages 149-150
Published in Bulletin of The British Ornithologists' Club, in 1927, in volume 47, pages 151-170
Published in Bulletin of The British Ornithologists' Club, in 1927, in volume 48, pages 19-22
Published in Bulletin of The British Ornithologists' Club, in 1927, in volume 48, pages 22-27