Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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