APA (7th ed.) Citation

(1991). Luftverkehr - offener Himmel über Europa?

Chicago Style (17th ed.) Citation

Luftverkehr - Offener Himmel über Europa? Münster, 1991.

MLA (9th ed.) Citation

Luftverkehr - Offener Himmel über Europa? 1991.

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