Crowther, J. G. (1957). Discoveries and inventions of the twentieth century (4th ed.).
Chicago Edition CitationCrowther, J. G. Discoveries and Inventions of the Twentieth Century. 4th ed. 1957.
MLA Edition CitationCrowther, J. G. Discoveries and Inventions of the Twentieth Century. 4th ed. 1957.
Warning: These citations may not always be 100% accurate.