Armstrong, Margaret N. “Canyon and Glacier.” Overland Monthly and Out West
Magazine, Feb. 1912. 95-104. Web. 22 Feb. 2013.

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Armstrong Margaret, N. Field Book of Western Wildflowers. New York, N.Y. C.P.
Putman and Sons. 1915. Web 22 Feb. 2013.

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Armstrong, Margaret, N. “Thistle Sage.” 1915. Field Book of Western Wildflowers.
Google Books.  Feb 22. 2013.

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Gullans, Charles and John Espey. “Margaret Armstrong and American Trade
Bindings: With a Checklist of Her Designed Bindings and Covers.” Web 22 Feb. 2013.

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Keeping Soul Alive “Margaret Armstrong’s Field Book of Western Wildflowers”. 24
October 2010. Malcolm Lowry’s Library. Blog.
http://malcolmlowryslibrary.blogspot.com/2010/10/margaret-armstrong-field-book-of.html. 13 March 2013.

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The Passing Tramp. “Had I But Known Authors #2 Margaret Armstrong HIBK
Patrician.” 28 January 2013. The Passing Tramp: Wandering Through the Mystery Genre Book by Book. Blog.
http://thepassingtramp.blogspot.com/2012/01/had-i-but-known-authors-2-margaret-n.html.13 March 2013.