Clute, John; Nicholls, Peter, eds. (1995) [1993]. "Game-Worlds". The Encyclopedia of Science Fiction. technical editor, John Grant; contributing editor, Brian Stableford (2nd ed.). New York: St. Martin's Griffin. p. 471. ISBN0-312-09618-6. The BattleTech novels by Robert Thurston are more straightforwardly sf, specifically space opera.