Varios (1890). Henry Richards Luard, ed. Flores Historiarum(en latín)3. Londres. p. 318-319. Consultado el 17 de octubre de 2017. «Proinde jussit rex arietem fabricari, quem Hebraei nichonta vocant, quasi vincens omnia, et lupum guerrae. Verum aries indecens et incompositus parum aut nihil profuit. Lupus autem belli, minus sumptuosus, inclusis plus nocuit.».
Bain, Joseph (1881). Calendar of Documents Relating to Scotland(en inglés)5. p. 201. Consultado el 17 de octubre de 2017. «To Reginald janitor, for wages of 6 men guarding the fagots and hods made by him to fill the ditch round Stirling castle, and also guarding the beams of the 'Lupus guerre' at night, for 40 nights in June an July, 40s. [fo. 68 v.].».
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Prestwich, Michael (1988). Edward I(en inglés). University of California. p. 502. ISBN0-520-06266-3. Consultado el 17 de octubre de 2017. «More success was gained by employing a machine called a Warwolf. Documents show that this had taken a team of five master carpenters and fifty men a long time to construct...».
