Published in Bulletin of The British Ornithologists' Club, in 1933, in volume 53, pages 119-124

Published in Bulletin of the British Ornithologists' Club, in 1933, in volume 53, pages 129-161

Published in Bulletin of the British Ornithologists' Club, in 1933, in volume 53, pages 154

Published in Bulletin of The British Ornithologists' Club, in 1933, in volume 54, pages 19-20