APA (7th ed.) Citation

Richardson, O. W. (1916). The electron theory of matter (2d ed.). The University press.

Chicago Style (17th ed.) Citation

Richardson, O. W. The Electron Theory of Matter. 2d ed. Cambridge: The University press, 1916.

MLA (9th ed.) Citation

Richardson, O. W. The Electron Theory of Matter. 2d ed. The University press, 1916.