Incoming Resources
- Penguin Books, Harmondsworth, Eng., New York, N.Y., c1981, 1984 printing
- Penguin, Harmondsworth, Eng., New York, 1976
- Puffin Books, Harmondsworth, Eng., 1976
- Penguin Books, Harmondsworth, Eng., Baltimore, 1972
- Penguin Books, Harmondsworth, Eng., 1946