Cita APA

Bergonzi, B. 1. (1970). The Twentieth century. London, Sydney: Sphere Books.

Citación estilo Chicago

Bergonzi, Bernard 1929-. The Twentieth Century. London, Sydney: Sphere Books, 1970.

Cita MLA

Bergonzi, Bernard 1929-. The Twentieth Century. London, Sydney: Sphere Books, 1970.