Stoicism: Learning about Stoicism, Skepticism, and Existentialism

Thus Spoke Zarathustra

Skepticism: The Stoic, the Skeptic, and the Existentialist Thinkers of the World

Human, All Too Human: A Book for Free Spirits

Being and Nothingness

The History of Philosophy: Thoughts from Existentialism, Stoicism, and Skepticism

Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies (Academic Edition)

Existentialist Thinking: Skepticism and Existentialism Explained in Detail

What Would Plato Think?: 200+ Philosophical Questions That Could Change Your Life

Skeptical Thinking: How to See Life through the Eyes of Skeptics and Existentialists

On the Genealogy of Morality

Existentialism: Figuring out the Meaning of Life and Ethics with the Great Philosophers

Critical Thinking: Skills to Contemplate Life, Nature, the Human Race, and More

Logic: A Very Short Introduction, 2nd Edition

Philosophers: The Greatest Philosophers and Thinkers of the World

A Rulebook for Arguments

The Logic of Scientific Discovery

The Classic Collection of Soren Kierkegaard: Fear and Trembling, Philosophical Fragments, Sickness Unto Death

Summary of Sarah Bakewell's At the Existentialist Café