Kuelpe, Oswald: Introduction to Philosophy. Translation by Pillsbury and Titchener. (Full and accurate account of the traditional terms and doctrines of philosophy.)
Hibben, J. G.: Problems of Philosophy. (Brief and elementary.)
Sidgwick, Henry: Philosophy, its Scope and Relations.
Paulsen, Friedrich: Introduction to Philosophy. Translation by Thilly.
Baldwin, J. M.: Dictionary of Philosophy. (Full, and convenient for reference.)
Ferrier, J. F.: Lectures on Greek Philosophy. (Interpretation of the beginning and early development of philosophy.)
Burnet, J.: Early Greek Philosophy. Translation of the sources.
Fairbanks, A.: The First Philosophers of Greece.
Gomperz, Th.: Greek Thinkers, Vol. I. Translation by Magnus. (On the first development of philosophical problems.)