APA (7th ed.) Citation

Roadcap, R. R. (1950). Helicopter Air Service, Inc.: Proposed system. Helicopter Air Service, Inc..

Chicago Style (17th ed.) Citation

Roadcap, Roy R. Helicopter Air Service, Inc.: Proposed System. [S.l.]: Helicopter Air Service, Inc., 1950.

MLA (8th ed.) Citation

Roadcap, Roy R. Helicopter Air Service, Inc.: Proposed System. Helicopter Air Service, Inc., 1950.

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