Levins, R. (1969), "Some demographic and genetic consequences of environmental heterogeneity for biological control", Bulletin of the Entomological Society of America, 15 (3): 237–240, doi:10.1093/besa/15.3.237, S2CID85600923
Levins, R. (1969), "Some demographic and genetic consequences of environmental heterogeneity for biological control", Bulletin of the Entomological Society of America, 15 (3): 237–240, doi:10.1093/besa/15.3.237, S2CID85600923