APA (7th ed.) Citation

Allen, G. (2005). Falling in Love; With Other Essays on More Exact Branches of Science. Project Gutenberg.

Chicago Style (17th ed.) Citation

Allen, Grant. Falling in Love; With Other Essays on More Exact Branches of Science. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Allen, Grant. Falling in Love; With Other Essays on More Exact Branches of Science. Project Gutenberg, 2005.

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