APA

Schlick M., Rynin D., . (19491939). Problems of ethics. New York: Prentice-Hall.

Chicago

Schlick Moritz, Rynin David, . 19491939. Problems of ethics. New York: Prentice-Hall.

Harvard

Schlick M., Rynin D., . (19491939). Problems of ethics. New York: Prentice-Hall.

MLA

Schlick Moritz, Rynin David, . Problems of ethics. New York: Prentice-Hall. 19491939.