(EN) Damon Knight, Cosmic Jerrybuilder: A. E. Van Vogt, in In Search of Wonder, 2ª ed., Advent, marzo 1967 [1956], p. 62, ISBN 0-911682-15-5, LCCN 67-4260, OCLC 489853415.
«No serious effort has been made to efface the evidence – most of the names of principal characters are transparent disguises.... Van Vogt's Linn is Augustan Rome in almost every detail. (Even the coinage is in sesterces.)»