APA (7th ed.) Citation

Spencer, H. (1872). The principles of psychology: Vol. 2 / by Herbert Spencer (Second edition, stereotyped.). Williams and Norgate.

Chicago Style (17th ed.) Citation

Spencer, Herbert. The Principles of Psychology: Vol. 2 / by Herbert Spencer. Second edition, stereotyped. London: Williams and Norgate, 1872.

MLA (8th ed.) Citation

Spencer, Herbert. The Principles of Psychology: Vol. 2 / by Herbert Spencer. Second edition, stereotyped. Williams and Norgate, 1872.

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