1. The basis for host plant specificity in Tephritis dilacerata and T. formosa (Diptera: Tephritidae);Berube;Entomophaga,1978
2. Berube , D. E. Harris P. 1978 Bud size selection by ovipositing U. affinis and U. quadrifasciata in B. C 210 217
3. Establishment of Urophora affinis Frild. and U. quadrifasciata (Meig.) (Diptera: Tephritidae) in Canada for the biological control of diffuse and spotted knapweed;Harris;Z. ang. Ent.,1980
4. Myers , J. Harris , P. Distribution of Urophora galls in flower heads of diffuse and spotted knapweed in British Columbia