Eshelman, Larry J. (1999). "Mutation and Crossover". In Bäck, Thomas; Fogel, David B.; Michalewicz, Zbigniew (eds.). Evolutionary computation. Vol. 1, Basic algorithms and operators. Boca Racon: CRC Press. p.68. ISBN0-585-30560-9. OCLC45730387.
Schwefel, Hans-Paul (1977). Numerische Optimierung von Computermodellen (PhD thesis) (in German). Basel: Birkhäuser Verlag. Translation: Numerical optimization of computer models, Wiley, Chichester, 1981. ISBN0-471-09988-0. OCLC8011455.