Incoming Resources
- Penguin, Harmondsworth, 1972
- Penguin Books, Harmondsworth, 1982
- Penguin Books, Harmondsworth, 1986
- Penguin, Harmondsworth, 1954, 1982 printing
- Penguin Books, Harmondsworth, 1949
- Penguin, Harmondsworth, 1969
- Penguin, Harmondsworth, 1989