APA (7th ed.) Citation

Langworthy, J. L. (2004). The Aeroplane Boys on the Wing Or, Aeroplane Chums in the Tropics. Project Gutenberg.

Chicago Style (17th ed.) Citation

Langworthy, John Luther. The Aeroplane Boys on the Wing Or, Aeroplane Chums in the Tropics. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Langworthy, John Luther. The Aeroplane Boys on the Wing Or, Aeroplane Chums in the Tropics. Project Gutenberg, 2004.

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