Books
- Foundation 10. 1976
- Foundation 11 and 12. 1977
- Foundation 17. 1979
- Foundation 20. 1980
- Foundation 22. 1981
- Foundation 27. 1983
- Foundation 30. 1984
- Foundation 31. 1984
- Foundation 34. 1985
- Foundation 36. 1986
- Foundation 41. 1987
- Foundation 42. 1988
- Foundation 52. 1991