Plinius, Naturalis Historia, liber VIII. In: Pliny Natural History with an English translation in ten volumes Volume III Libri VIII–XI By H. Rackham, 1961, p. 104ff.:
postea elephantum iussit induci, haud alio magis spectaculo laetatus : horrentibus quippe villis per totum corpus ingenti primum latratu intonuit, mox ingruit adsultans contraque membra exurgens hinc et illinc artifici dimicatione, qua maxume opus esset infestans atque evitans, donec adsidua rotatum vertigine adflixit ad casum eius tellure concussa.
