Cita APA (7th ed.)

Gregory, R. L. (1970). The intelligent eye. Weidenfeld and Nicolson.

Cita Chicago (17th ed.)

Gregory, Richard Langton. The Intelligent Eye. Londres: Weidenfeld and Nicolson, 1970.

Cita MLA (9th ed.)

Gregory, Richard Langton. The Intelligent Eye. Weidenfeld and Nicolson, 1970.