APA (7th ed.) Citation

(2011). Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward". Project Gutenberg.

Chicago Style (17th ed.) Citation

Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward". Project Gutenberg, 2011.

MLA (9th ed.) Citation

Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward". Project Gutenberg, 2011.

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