Kellogg, Day Otis; Baynes, Thomas Spencer (13 December 1903). "The Encyclopædia Britannica: A-ZYM". Werner. Archived from the original on 21 July 2021. Retrieved 4 January 2021 – via Google Books.
Kellogg, Day Otis; Baynes, Thomas Spencer (13 December 1903). "The Encyclopædia Britannica: A-ZYM". Werner. Archived from the original on 21 July 2021. Retrieved 4 January 2021 – via Google Books.