Bowen, J. (2010). The economic geography of air transportation: Space, time, and the freedom of the sky. Routledge.
Chicago-referens (17:e uppl.)Bowen, John. The Economic Geography of Air Transportation: Space, Time, and the Freedom of the Sky. London: Routledge, 2010.
MLA-referens (9:e uppl.)Bowen, John. The Economic Geography of Air Transportation: Space, Time, and the Freedom of the Sky. Routledge, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.