APA

United States of America, . (1947). Telegraph and telephone age. New York: Telegraph and telephone age.

Chicago

United States of America, . 1947. Telegraph and telephone age. New York: Telegraph and telephone age.

Harvard

United States of America, . (1947). Telegraph and telephone age. New York: Telegraph and telephone age.

MLA

United States of America, . Telegraph and telephone age. New York: Telegraph and telephone age. 1947.