APA (7th ed.) Citation

Gann, W. D. (1927). The tunnel thru the air: Or, Looking back from 1940. Financial Guardian.

Chicago Style (17th ed.) Citation

Gann, William D. The Tunnel Thru the Air: Or, Looking Back from 1940. New York: Financial Guardian, 1927.

MLA (9th ed.) Citation

Gann, William D. The Tunnel Thru the Air: Or, Looking Back from 1940. Financial Guardian, 1927.