- Loneliness in Philosophy, Psychology, and Literature
- Feeling Lonesome: The Philosophy and Psychology of Loneliness
- Achilles of Rationalist Arguments: The Simplicity, Unity and the Identity of Thought and Soul from the Cambridge Platonists to Kant, A Study in the History ... Internationales D'histoire Des Idees Min
- Metaphysical Dualism, Subjective Idealism, and Existential Loneliness: Matter and Mind
- The Philosophical Roots of Loneliness and Intimacy: Political Narcissism and the Problem of Evil










