1. The integration of chemical and biological control of the spotted alfalfa aphid;Stern;Hilgardia,1959
2. California Tree Fruit Agreement 1974 Annual Report for Pears, Plums, Peaches and Nectarines.
3. Pear Pest Management. University of California Publ. 4086, pp. 1-234 (1978).
4. University of California Integrated Pest Management [Online]. Available: http://ucipm.ucdavis.edu/IPMPROJECT/pubs.html [2009].