1962

• Opler, P.A. & Powell, J.A., 1962. Taxonomic and Distributional Studies on the western components of the Apodemia mormo complex (Riodinidae). Journal of the Lepidopterological Society 15(3): 145–171. BHL Reference page. 

1971

• Opler, P.A. 1971. Biological and systematic considerations on the "emarginana group" of the genus Epinotia (Tortricidae). Journal of Research on the Lepidoptera 25(2): 115–123. full article (pdf). Reference page. 

• Opler, P.A. 1971a. Seven new lepidopterous leaf-miners associated with Quercus agrifolia (Heliozelidae, Gracilariidae). The Journal of the Lepidopterists' Society 25(3): 194–211. full article (pdf). Reference page. 

2017

• Seltmann, K.C., Cobb, N.S., Gall, L.F., Bartlett, C.R., Basham, M.A., Betancourt, I., Bills, C. Brandt, B., Brown, R.L., Bundy, C., Caterino, M.S., Chapman, C., Cognato, A.I., Colby, J., Cook, S.P., Daly, K.M., Dyer, L.A., Franz, N.M., Gelhaus, J.K., Grinter, C.C., Harp, C.E., Hawkins, R.L., Heydon, S.L., Hill, G.M., Huber, S., Johnson, N.F., Kawahara, A.Y., Kimsey, L.S., Kondratieff, B.C., Krell, F.T., Leblanc, L., Lee, S., Marshall, C.L., Mccabe, L.M., McHugh, J.V., Menard, K.L., Opler, P.A., Palffy-Muhoray, N., Pardikes, N., Peterson, M.A., Pierce, N.E., Poremski, A., Sikes, D.S., Weintraub, J.D., Wikle, D., Zaspel, J.M. & Zolnerowich, G. 2017. LepNet: The Lepidoptera of North America Network. Zootaxa 4247(1): 73–77. DOI: 10.11646/zootaxa.4247.1.10 Full article (PDF). Reference page.