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Browning, E. (1900). The Complete Works of Elizabeth Barrett Browning Charlotte Porter & Helen A Clarke, (Ed.). (Vols 1-3). New York, NY: Thomas Y. Crowell & Co.
Dzwonkoski, P. (1986). American literary publishing houses, 1638-1899 (Ed.). Detroit, MI: Gale Research Co.
Gullans, C., & Espey, J. (1968). A Checklist of trade bindings designed by Margaret Armstrong. UCLA Library Occasional Papers, 16, 1 - 37.
Gullans, C., & Espey, J. (1991). Margaret Armstrong and American trade bindings. UCLA Library Occasional Papers, 6, 1 - 135.
Leypoldt, F. (1902). Christmas Number. The literary news: A monthly journal of current literature. XXIII (12), 357.
Penguin Group USA (2010). G. P. Putnam’s Sons. Retrieved from http://us.penguingroup.com/static/pages/publishers/adult/putnam.html
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University of Alabama. (2005 – 2006). Publishers’ bindings online, 1815-1930: The art of books. Retrieved from http://bindings.lib.ua.edu/designerbios/armstrong.html.
University of Delaware Library. (1996). Color printing in the 19th century. Retrieved from http://www.lib.udel.edu/ud/spec/exhibits/color/index.htm
University of Rochester. (2007). Beauty for commerce: Publishers' bindings, 1830 – 1910. Retrieved from http://www.lib.rochester.edu/index.cfm?page=3348.
Wilson, L. (1999). Margaret Armstrong: American book designer. Retrieved from http://home.tiac.net/~lmwilson/home.htm.