APA (7th ed.) Citation

Gosse, P. H. (2012). Omphalos An Attempt to Untie the Geological Knot. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gosse, Philip Henry. Omphalos An Attempt to Untie the Geological Knot. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Gosse, Philip Henry. Omphalos An Attempt to Untie the Geological Knot. Project Gutenberg, 2012.

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