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