- Gara, R. I., R. D. Geiszler, and W. R. Littke. 1984. Primary attraction of the mountain pine beetle to lodgepole pine in Oregon . Entomological Society of America, Annals 77:333-334.
- Gara, R. I., W. R. Littke, J. K. Agee, D. R. Geiszler, J. D. Stuart, and C. H. Driver. 1985. Influence of fires, fungi and mountain pine beetles on development of a lodgepole pine forest in southcentral Oregon. Pages 153-162 in Lodgepole pine: the species and its management. Symposium proceedings, 8-10 May 1984, Spokane, Washington.
- Geiszler, D. R., R. I. Gara, and W. R. Littke. 1984. Bark beetle infestations of lodgepole pine following a fire in south central Oregon . Zeitschrift fur Angewandte Entomologie 98:389-394.
- Gara, R. I., J. K. Agee, W. R. Littke, and D. R. Geisler. 1986. Fire wounds and beetle scars . Journal of Forestry 84:47-50.
- Gara, R. I., W. R. Littke, J. K. Agee, D. R. Geiszler, J. D. Stuart, and C. H. Driver. 1985. Influence of fires, fungi and mountain pine beetle on development of a lodgepole pine forest in southcentral Oregon. Pages 153-162 in D. M. Baumgartner et al., Lodgepole pine: the species and its management. Symposium proceedings, Cooperative Extension, Washington State University, Pullman, Washington.
- Gara, R., W. Littke, and D. Rhoades. 1993. Emmission of ethanol and monoterpenes by fungal infected lodgepole pine trees . Photochemistry 34:987-990.
- Littke, W. 1992. Monitoring pest populations following precommercial thinning operations in western forests. Page 105 In Douglas C. Allen and L.P. Abrahamson (eds.), Proceedings: North American Forest Insect Work Conference, Denver, Colorado, March 25-28, 1991. United States Department of Agriculture, Forest Service, Pacific Northwest Research Station (Portland, OR), General Technical Report PNW-GTR-294.