APA (7th ed.) Citation

Spencer, H. (1855). The principles of psychology. Longman, Brown, Green, and Longmans.

Chicago Style (17th ed.) Citation

Spencer, Herbert. The Principles of Psychology. London: Longman, Brown, Green, and Longmans, 1855.

MLA (9th ed.) Citation

Spencer, Herbert. The Principles of Psychology. Longman, Brown, Green, and Longmans, 1855.

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