Johnson, J. B., R. H. Hagen, and E. A. Martinko. 2010. Effect of succession and habitat area on wandering spider abundance in an experimental landscape. Journal of the Kansas Entomological Society 83: 141–153.
Martinko, E. A., R. H. Hagen, and J. A. Griffith. 2006. Successional change in the insect community of a fragmented landscape. Landscape Ecology 21: 711–721.
Hagen, R. H. 1999. Prolegs of Papilionini (Lepidoptera: Papilionidae): Alternative solutions to the problem of attachment. IN: Byers, G. W., R. H. Hagen, and R. W. Brooks, Eds. Entomological Contributions in Memory of Byron A. Alexander. University of Kansas Natural History Museum, Special Publication 24: 218–232.
Smith, D. R. and R. H. Hagen. 1996. Population structure and interdemic selection in the cooperative spider, Anelosimus eximius. Journal of Evolutionary Biology 9: 589–608.
Hagen, R. H. 1990. Population structure and host use in hybridizing subspecies of Papilio glaucus (Lepidoptera: Papilionidae). Evolution 44: 1914–1930.