철학

Infinity s Child by Charles V. De Vet

In the School Room Chapters in the Philosophy of Education by John S. Hart

First Principles by Herbert Spencer

First Lessons in Natural Philosophy for Beginners by Joseph C. Martindale

John Stuart Mill His Life and Works by H. R. Fox Bourne et al.

John Brown by W. E. B. Du Bois

Ion by Plato

Introduction to the Philosophy and Writings of Plato by Thomas Taylor

Introduction to Mathematical Philosophy by Bertrand Russell

Initiation into Philosophy by Émile Faguet