Cita APA (7th ed.)
Clifford, W. K. (1890). Seeing and thinking.
Cita Chicago (17th ed.)
Clifford, William Kingdon. Seeing and Thinking. London, 1890.
Cita MLA (9th ed.)
Clifford, William Kingdon. Seeing and Thinking. 1890.
Atenció: Aquestes cites poden no estar 100% correctes.