Incoming Resources
- Penguin Books, Harmondsworth, Eng., New York, 1976, c1950
- Penguin, Harmondsworth, Eng., Baltimore, Md., 1972
- Penguin Books, Harmondsworth, Eng., New York, 1981, 1976
- Penguin, Harmondsworth, Eng., New York, 1976
- Puffin Books, Harmondsworth, Eng., 1976
- Penguin Books, Harmondsworth, Eng., New York, 1980
- Penguin Books, Harmondsworth, Eng., New York, c1981