- “The Symbolism of Krupp,” an essay by Gilbert Keith Chesterton in the collection Utopia of Usurers and Other Essays (1917)
- "Krupp, Alfred," in Encyclopædia Britannica (11th ed., 1911)
- "Krupp, Alfred," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Krupp, Friedrich," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Krupp, Friedrich Alfred," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
- "Krupp Foundries, Social Work at," in The New International Encyclopædia, New York: Dodd, Mead and Co. (1905)
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