Cita APA (7th ed.)

Purdy, J. (1961). Colour of darkness. Secker & Warburg.

Cita Chicago (17th ed.)

Purdy, James. Colour of Darkness. Lond.: Secker & Warburg, 1961.

Cita MLA (8th ed.)

Purdy, James. Colour of Darkness. Secker & Warburg, 1961.