APA (7th ed.) Citation

(2004). Scientific American Supplement, No. 821, September 26, 1891. Project Gutenberg.

Chicago Style (17th ed.) Citation

Scientific American Supplement, No. 821, September 26, 1891. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Scientific American Supplement, No. 821, September 26, 1891. Project Gutenberg, 2004.

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