APA (7th ed.) Citation

Oppel, F. (1987). Early flight: From balloons to biplanes. Castle.

Chicago Style (17th ed.) Citation

Oppel, Frank. Early Flight: From Balloons to Biplanes. Seacaucus, N.J.: Castle, 1987.

MLA (9th ed.) Citation

Oppel, Frank. Early Flight: From Balloons to Biplanes. Castle, 1987.

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