- Kaya, H. K. 1984. Nematode parasites of bark beetles. Pp. 727-754. in: Plant and Insect Nematodes. Nickle, W. R. (eds.) Marcel Dekker, Inc.,New York. xiv+925 pp..
- Nickle, W. R. 1963c. Observations on the effect of nematodes on Ips confusus (LeConte) and other bark beetles. Journal of Insect Pathology 5:386-389.
- Nickle, W. R., and H. E. Welch. 1984. History, development, and importance of insect nematology. Pp. 627-653. in: Plant and Insect Nematodes. Nickle, W. R. (eds.) Marcel Dekker, Inc.,New York. xiv+925 pp..
- Nickle, W. R. 1962. Nematodes of bark beetles [abstract] . Entomological Society of Ontario, Proceedings 93:131.
- Nickle, W. R. 1963a. Bovienema (Nematoda: Allantonematidae), a new genus parasitizing bark beetles of the genus Pityogenes Bedel, with notes on other endoparasitic nematodes of scolytids . Helminthological Society of Washington, Proceedings 30:256-262.
- Nickle, W. R. 1963b. Notes on the genus Contortylenchus Ruhm, 1956, with observations on the biology and life history of C. elongatus (Massey, 1960) n. comb., a parasite of a bark beetle. Helminthological Society of Washington, Proceedings 30(2): 218-223.
- Nickle, W. R. 1963d. The endoparasitic nematodes of California bark beetles with descriptions of Bovienema n. g. and Neoparasitylenchus elongatus n. comb. Unpublished dissertation, University of California, Berkeley. 210 p.
- Nickle, W. R. 1964. A review of the Dutch elm disease: biological control . Canada Department of Forestry, Forest Entomology and Pathology Branch, Bimonthly Progress Report 20:5-7.
- Nickle, W. R. 1967a. Methods of control. Biological control. Page 18 in A. G. Davidson (ed.), Dutch elm disease. Canada Department of Forestry and Rural Development, Canadian Forestry Service, Publication 1187. 23 p.
- Nickle, W. R. 1967b. On the classification of the insect parasitic nematodes of the Sphaerulariidae Lubbock, 1861 (Tylenchoidea: Nematoda) . Helminthological Society of Washington, Proceedings 34:72-94.
- Nickle, W. R. 1970. A taxonomic review of the genera of the Aphelenchoidea (Fuchs, 1937) Thome, 1949 (Nematoda: Tylenchida) . Journal of Nematology 2:375-392.
- Nickle, W. R. 1971. Behavior of the shothole borer, Scolytus rugulosus altered by the nematode parasite Neoparasitylenchus rugulosi . Entomological Society of America, Annals 64:751.