Barnes & Noble · Cliffs Notes · HarperCollins · Twayne Publishers
| title | ISBN-13 | year of publica- tion |
|---|---|---|
| Ethics: An introduction to theories and problems | 978-0-06-460139-9 | 1974 |
| History of Philosophy | 978-0-06-460002-6 | 1968 |
| Ideas of the great philosophers | 978-1-56619-271-2 | 1993 |
| Ideas of the Great Philosophers | 978-0-06-463218-8 | 1966 |
| John Locke | 978-0-8057-3539-0 | 1975 |
| Philosophy | 978-0-8220-1754-7 | 1982 |