Kant, Idealism, and Nietzsche:
Kant - Critique of Pure Reason
Kant - Groundwork of the Metaphysics of Morals
Fichte - An Attempt at a Critique of All Revelation
Hegel - The Phenomenology of Spirit
Hegel - Philosophy of History
Schopenhauer - The World as Will and Representation
Nietzsche - Beyond Good and Evil
Nietzsche - On the Genealogy of Morals
Nietzsche - Twilight of the Idols
Marxism:
Marx - Economic and Philosophical Manuscripts of 1844
Marx - Theses on Feuerbach
Marx - The German Ideology
Marx - Capital
Lukacs - History and Class Consciousness
Gramsci - The Prison Notebooks
Phenomenology:
Husserl - The Crisis of the European Sciences
Heidegger - Being and Time
Merleau-Ponty - Phenomenology of Perception
Structuralism:
Saussure - Course on General Linguistics
Levi-Strauss - Tristes Tropiques
Barthes - Mythologies
Psychoanalysis:
Freud - The Interpretation of Dreams
Freud - Totem and Taboo
Freud - Beyond the Pleasure Principle
Freud - Civilization and its Discontents
Jung - Man and His Symbols
Lacan - Ecrits
Lacan - Seminars XI: The Four Fundamental Concepts of Psychoanalysis
Frankfurt School:
Benjamin - "The Work of Art in the Age of Mechanical Reproduction"
Fromm - The Fear of Freedom
Horkheimer - "Traditional and Critical Theory"
Horkheimer and Adorno - The Dialectic of Enlightenment
Adorno - Minima Moralia
Marcuse - Eros and Civilization
Marcuse - The One-Dimensional Man
Adorno - Negative Dialectics
Habermas - The Structural Transformation of the Public Sphere
Habermas - The Theory of Communicative Action
Other:
Bataille - The Accursed Share
Bataille - Visions of Excess
Debord - The Society of the Spectacle
Vaneigem - The Revolution of Everyday Life