Cita APA (7th ed.)

Crowther, J. G. (1966). Discoveries and inventions of the 20th century (5th ed.). Routledge.

Cita Chicago (17th ed.)

Crowther, J. G. Discoveries and Inventions of the 20th Century. 5th ed. Lond.: Routledge, 1966.

Cita MLA (8th ed.)

Crowther, J. G. Discoveries and Inventions of the 20th Century. 5th ed. Routledge, 1966.