"Access Excellence". Crossing-over: Genetic Recombination. The National Health Museum Resource Center. Arquivado dende o orixinal o 31 de xullo de 2013. Consultado o February 23, 2011.
"Access Excellence". Crossing-over: Genetic Recombination. The National Health Museum Resource Center. Arquivado dende o orixinal o 31 de xullo de 2013. Consultado o February 23, 2011.