Engelberg
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- "Engelberg," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Engelberg," by William Augustus Brevoort Coolidge in Encyclopædia Britannica (11th ed., 1911)
- "Abbey of Engelberg," by Cyprian Alston in Catholic Encyclopedia, (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
- "Engelberg," in The Encyclopedia Americana, New York: The Encyclopedia Americana Corporation (1920)