APA (7th ed.) Citation

Whale, G. (1996). British Airships, Past, Present, and Future. Project Gutenberg.

Chicago Style (17th ed.) Citation

Whale, George. British Airships, Past, Present, and Future. Project Gutenberg, 1996.

MLA (9th ed.) Citation

Whale, George. British Airships, Past, Present, and Future. Project Gutenberg, 1996.

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