Cita APA (7a ed.)

Bullock, A. (1971). The twentieth century: A promethean age. Thames and Hudson.

Cita Chicago Style (17a ed.)

Bullock, Alan. The Twentieth Century: A Promethean Age. London: Thames and Hudson, 1971.

Cita MLA (9a ed.)

Bullock, Alan. The Twentieth Century: A Promethean Age. Thames and Hudson, 1971.