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Magazine, Feb. 1912. 95-104. Web. 22 Feb. 2013.


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


Armstrong, Margaret, N. “Thistle Sage.” 1915. Field Book of Western Wildflowers.
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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.


Keeping Soul Alive “Margaret Armstrong’s Field Book of Western Wildflowers”. 24
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The Passing Tramp. “Had I But Known Authors #2 Margaret Armstrong HIBK
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