APA (7th ed.) Citation

(1968). The Freedom of the air. A. W. Sijthoff.

Chicago Style (17th ed.) Citation

The Freedom of the Air. Leyden: A. W. Sijthoff, 1968.

MLA (9th ed.) Citation

The Freedom of the Air. A. W. Sijthoff, 1968.

Warning: These citations may not always be 100% accurate.