Cita APA (7a ed.)

Carus, P. (1890). The ethical problem: Three lectures, delivered at the invitation of the Board of Trustees before the Society for Ethical Culture of Chicago, in June 1890. The Open Court Publishing Company.

Cita Chicago Style (17a ed.)

Carus, Paul. The Ethical Problem: Three Lectures, Delivered at the Invitation of the Board of Trustees Before the Society for Ethical Culture of Chicago, in June 1890. Chicago: The Open Court Publishing Company, 1890.

Cita MLA (9a ed.)

Carus, Paul. The Ethical Problem: Three Lectures, Delivered at the Invitation of the Board of Trustees Before the Society for Ethical Culture of Chicago, in June 1890. The Open Court Publishing Company, 1890.