"Encyclopaedia Britannica Inc". The Electronic Encyclopedia of Chicago. Chicago Historical Society. 2005. Archived from the original on 2018-10-20. Retrieved 2019-02-09.
doi.org
Harris, Chauncy D. (1975). "The New Encyclopædia Britannica". Geographical Review. 65 (1). Geographical Review, Vol. 65, No. 1: 141–145. doi:10.2307/213852. JSTOR213852.
"Encyclopaedia Britannica Inc". The Electronic Encyclopedia of Chicago. Chicago Historical Society. 2005. Archived from the original on 2018-10-20. Retrieved 2019-02-09.