APA (7th ed.) Citation

Cowin, H. W. (1999). X-planes : research aircraft 1891-1970 : a unique pictorial record of flying prototypes, their designers and pilots / Hugh W. Cowin: Research aircraft 1891-1970 : a unique pictorial record of flying prototypes, their designers and pilots. Osprey.

Chicago Style (17th ed.) Citation

Cowin, Hugh W. X-planes : Research Aircraft 1891-1970 : A Unique Pictorial Record of Flying Prototypes, Their Designers and Pilots / Hugh W. Cowin: Research Aircraft 1891-1970 : A Unique Pictorial Record of Flying Prototypes, Their Designers and Pilots. Oxford: Osprey, 1999.

MLA (9th ed.) Citation

Cowin, Hugh W. X-planes : Research Aircraft 1891-1970 : A Unique Pictorial Record of Flying Prototypes, Their Designers and Pilots / Hugh W. Cowin: Research Aircraft 1891-1970 : A Unique Pictorial Record of Flying Prototypes, Their Designers and Pilots. Osprey, 1999.

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