Krygier, John (December 2017). "Republic of Letters". A Series of Series. Ohio Wesleyan University. Archived from the original on 13 April 2019. Retrieved 10 August 2019.
"Routledge, George". Dictionary of National Biography, 1885-1900, Volume 49. Archived from the original on 14 September 2015. Retrieved 10 November 2015 – via Wikisource.
Krygier, John (December 2017). "Republic of Letters". A Series of Series. Ohio Wesleyan University. Archived from the original on 13 April 2019. Retrieved 10 August 2019.
wikisource.org
en.wikisource.org
"Routledge, George". Dictionary of National Biography, 1885-1900, Volume 49. Archived from the original on 14 September 2015. Retrieved 10 November 2015 – via Wikisource.
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Franklin 1986. Franklin, Norman (1986). Routledge & Kegan Paul: 150 years of great publishing. London: Routledge & Kegan Paul. OCLC24489168.
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