Published in Bulletin of the British Ornithologists' Club, in 1972, in volume 92, pages 53-57

Published in Bulletin Br Orn Club, in 1972, in volume 92, pages 138-141

Published in Bulletin Br Orn Club, in 1972, in volume 92, pages 142-144

Published in Bulletin of the British Ornithologists' Club, in 1972, in volume 92, issue 3 & 4, pages 106-113