• Professor Marc Cohen, University of Washington, "Socratic Definitions"
• Professor Ralph Wedgewood, Oxford University, "Plato's Euthyphro"

Phaedo

• Professor Marc Cohen, University of Washington, "Phaedo"
• Professor Alfred J. Freddoso, University of Notre Dame, Introduction to Philosophy, Plato

Categories

• Professor Cynthia Freeland, University of Houston, "Aristotle's CATegories"
• Professor Marc Cohen, University of Washington, "Predication and Ontology: The Categories"
• Professor Robin Smith, Texas A&M University, "Predication, Homonymy, and the Categories"
• Professor Alfred J. Freddoso, University of Notre Dame, Lecture Outlines, Aristotle

Physics

• Professor Cynthia Freeland, University of Houston, "Aristotle's Physics, Book II"
• Professor Alfred J. Freddoso, University of Notre Dame, Lecture Outlines, Aristotle
• G. J. Mattey's "Background to Seventeenth Century Philosophy"

Metaphysics

• Professor Cynthia Freeland, University of Houston, "Aristotle's Metaphysics, Books VII and VIII (Z and H): Highlights"
• Professor Joe Sachs, St. John's College, Annapolis, "Aristotle (384-322 BCE.) Metaphysics"
• Professor Alfred J. Freddoso, University of Notre Dame, Lecture Outlines, Aristotle

Confessions

• Catholic Encyclopedia entry "Teaching of St. Augustine of Hippo" (general article)
• Internet Encycolpedia of Philosophy entry "Augustine (354-430)" (general article)
• Professor Gyula Klima, Fordham University, "Time and Eternity in Augustine (and in Medieval Scholasticism)"

Proslogion

• Stanford Encyclopedia of Philosophy entry "Ontological Arguments, Section 8, St. Anselm's Ontological Argument" (advanced)
• Professor Curtis Brown, Trinity University, "Anselm: The Ontological Argument"

Summa Theologica

• Stanford Encyclopedia of Philosophy entry "Saint Thomas Aquinas" (advanced)

Meditations on First Philosophy

• Internet Encycolpedia of Philosophy entry "René Descartes (1596-1650)"
• G. J. Mattey's Philosophy 22 Lecture Notes: Descartes

An Enquiry Concerning Human Understanding

• Internet Encyclopedia of Philosophy entry "David Hume (1711-1776): Metaphysical and Epistemological Theories
• University of Edinburgh "Hume's Enquiry: An Interactive Guide" (Under Construction)
• G. J. Mattey's Philosophy 23 Lecture Notes: Hume

Critique of Pure Reason

• Internet Encyclopedia of Philosophy entry, Immanuel Kant (1724-1804) Metaphysics
• G. J. Mattey's Philosophy 175 Lecture Notes, Kant on his Predecessors, Analytic and Synthetic Judgments, Space, Time, Metaphysical Deduction

"The Fixation of Belief"

• Professor Bill Uzgalis, Oregon State University, Instructional Module on "The Fixation of Belief"
• Professor David Vessey, St. Olaf College, Peirce, "The Fixation of Belief"

"How to Make Our Ideas Clear"

• Professor Cynthia Freeland, University of Houston, "Overview of C. S. Peirce"

The Problems of Philosophy

• Professor John Perry, Stanford University, Russell's Problems of Philosophy (PDF)

Apology

• Professor Jacques Bailly, University of Vermont, Apology Notes
• Professor Bruce Hauptli, Florida International University, Plato's "Apology"

Crito

• Professor Bruce Hauptli, Florida International University, Plato's "Crito"
• Dr. Andrew Latus, Memorial University, "Crito"

Republic

• Professor Alfred J. Freddoso, University of Notre Dame, Lecture Outlines, Socrates and Plato
• Professor Bruce Hauptli, Florida International University, Plato's "Republic" First Part

Nicomachean Ethics

• Professor Robert Berman, Xavier University of Louisiana, Text Outlines of Books I, II, III, VII

"Letter to Menoeceus" and "The Principle Doctrines"

• Professor D.S. Hutchinson, University of Toronto, Introduction to The Epicurus Reader
• Internet Encyclopedia of Philosophy Entry Epicurus
• G. J. Mattey's Philosophy 143 Lecture Notes: Epicurean Ethics

"Encheiridion"

• Internet Encyclopedia of Philosophy Entry Epictetus
• G. J. Mattey's Philosophy 143 Lecture Notes: Stoic Ethics

Leviathan

• Professor Bruce Hauptli, Florida International University, Hobbes "Leviathan"

Grounding for the Metaphysics of Morals

• Professor Geoffrey Sayre-McCord, University of North Carolina, Kant's Grounding for the Metaphysics of Morals (PDF)

Utilitarianism

• Internet Encyclopedia of Philosophy entry "John Stuart Mill"

Twilight of the Idols

• Professor Emeritus Tad Beckman, Harvey Mudd College, "Twilight of the Idols"
• G. J. Mattey's Philosophy 151 Lecture Notes: Nietzsche's Metaphysics, The Slave Revolt in Morality, Nietzsche's Critique of Religion

"The Humanism of Existentialism"

• fessor David Vessey, St. Olaf College, Study Guide for Sartre's "Existentialism is a Humanism"
• Professor Sally Fowler, North Central College, Virtual slide presentation "Jean-Paul Sartre: Existentialism"