APA (7th ed.) Citation

Spencer, H. (1977). The principles of ethics 1. Library Classics.

Chicago Style (17th ed.) Citation

Spencer, Herbert. The Principles of Ethics 1. Indianapolis: Library Classics, 1977.

MLA (9th ed.) Citation

Spencer, Herbert. The Principles of Ethics 1. Library Classics, 1977.

Warning: These citations may not always be 100% accurate.