1. Studies of the balsam woolly aphid, Adelges piceae (Ratz.) and its effects on balsam fir, Abies balsamea (L.);Balch;Publ. Dep. Agric. Can.,1952
2. Banks , C. J. 1953 Studies on the predator complex of certain Aphididae [Hem.] with particular reference to Aphis fabae (Scop.) Ph.D. Thesis University of London.
3. Europae centralis Aphides;Börner;Mitt. thüring. bot. Ges., Beiheft,1952
4. Notes on aphidophagous Syrphidae of Southern California;Campbell;Bull. S. Calif. Acad. Sci.,1924
5. The parasites and predators of potato aphids;Dunn;Bull. ent. Res.,1949