Johnson, K. P., B. L. Williams, D. M. Drown, R. J. Adams, and D. H. Clayton. 2002. The population genetics of host specificity: Genetic differentiation in dove lice (Insecta: Phthiraptera). Molecular Ecology 11:25-38.
Johnson, K. P., D. M. Drown, D. H. Clayton. 2001. A data based parsimony method of cophylogenetic analysis. Zoologica Scripta 30:79-87.
Johnson, K. P. 2001. Taxon sampling and the phylogenetic position of Passeriformes: Evidence from 916 avian cytochrome b sequences. Systematic Biology 50: 128-136.
Johnson, K. P. and J. Seger. 2001. Elevated rates of nonsynonymous substitutions in island birds. Molecular Biology and Evolution 18:874-881.
Johnson, K. P., F. R. Adler, and J. L. Cherry. 2000. Genetic and phylogenetic consequences of island biogeography. Evolution 54:387-396.