APA (7th ed.) Citation

(2013). Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 2 "Luray Cavern" to "Mackinac Island". Project Gutenberg.

Chicago Style (17th ed.) Citation

Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 2 "Luray Cavern" to "Mackinac Island". Project Gutenberg, 2013.

MLA (9th ed.) Citation

Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 2 "Luray Cavern" to "Mackinac Island". Project Gutenberg, 2013.

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