APA (7th ed.) Citation

Cressy, E. (1930). Discoveries and inventions of the twentieth century (3d ed., rev. and enl.). G. Routledge and sons, limited; E.P. Dutton and co..

Chicago Style (17th ed.) Citation

Cressy, Edward. Discoveries and Inventions of the Twentieth Century. 3d ed., rev. and enl. London : New York: G. Routledge and sons, limited; E.P. Dutton and co., 1930.

MLA (9th ed.) Citation

Cressy, Edward. Discoveries and Inventions of the Twentieth Century. 3d ed., rev. and enl. G. Routledge and sons, limited; E.P. Dutton and co., 1930.