Incoming Resources
- Penguin, Harmondsworth, Eng., New York, 1976
- Penguin Books, Harmondsworth, Eng., New York, 1980
- Penguin Books, Harmondsworth, Eng., New York, 1986, c1966
- Penguin Books, Harmondsworth, Eng., Baltimore, 1972
- Penguin Books, Viking Penguin, Harmondsworth, Eng., New York, 1963, 1987 printing