APA (7th ed.) Citation

Ladd, G. T. (1890). Introduction to philosophy: An inquiry after a rational system of scientific principles in their relation to ultimate reality. C. Scribner's Sons.

Chicago Style (17th ed.) Citation

Ladd, George Trumbull. Introduction to Philosophy: An Inquiry After a Rational System of Scientific Principles in Their Relation to Ultimate Reality. New York: C. Scribner's Sons, 1890.

MLA (9th ed.) Citation

Ladd, George Trumbull. Introduction to Philosophy: An Inquiry After a Rational System of Scientific Principles in Their Relation to Ultimate Reality. C. Scribner's Sons, 1890.