Yongdingmen (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Yongdingmen" in English language version.

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archive.org

Beals, Zephaniah Charles (1901). China and the Boxers: A short history of the Boxer outbreak, with two chapters on the sufferings of missionaries and a closing one on the outlook. M.E. Munson. p. 73. Retrieved 24 April 2014.
The Boxer Rising: A History of the Boxer Trouble in China (2, reprint ed.). Shanghai Mercury. 1901. p. 59. Retrieved 24 April 2014.

books.google.com

Larry Clinton Thompson (2009). William Scott Ament and the Boxer Rebellion: heroism, hubris and the "ideal missionary". McFarland. p. 52. ISBN 978-0-7864-4008-5.
The Boxer Rising: A History of the Boxer Trouble in China. Reprinted from the "Shanghai Mercury." (reprint ed.). Shanghai mercury, limited. 1900. p. 46. Retrieved 24 April 2014.