Delphi Collected Works of Sir Isaac Newton (Illustrated) (Delphi Series Six Book 26)

Delphi Complete Works of David Hume (Illustrated) (Delphi Series Seven Book 12)

Delphi Complete Works of Adam Smith (Illustrated) (Delphi Series Seven Book 10)

Delphi Collected Works of Karl Marx (Illustrated) (Delphi Series Seven Book 23)

Delphi Complete Works of Charles Darwin (Illustrated) (Series Five Book 22)

Delphi Collected Works of Immanuel Kant (Illustrated) (Delphi Series Seven Book 6)

Delphi Collected Works of Voltaire (Illustrated) (Series Six Book 5)

Delphi Complete Works of Aristotle (Illustrated) (Delphi Ancient Classics Book 11)

Delphi Collected Works of Saint Augustine (Illustrated) (Delphi Ancient Classics Book 68)

Delphi Complete Works of Michel de Montaigne (Illustrated) (Delphi Series Seven Book 18)